I never recommend reusing or rebuilding old rods. 28. Now, this is only a GENERAL guideline to get you close. But if you do this, don’t forget that pushrod lengths are different for stock rockers and ratio rockers, so that is another consideration). Use the product descriptions in our catalog to help you choose the right set of heads for your engine. Dual Port Cylinder Heads, 35 x 32mm Valves, 500-400 (per PAIR) are a GREAT deal on stock sized valve heads for that engine project you are going to do! Latest Additions. These sets have the same cylinder wall thickness that a stock 1600 cylinder has, so they are VERY reliable. These heads are more difficult to drive easy, but are the leader in horsepower. This is exactly what 4340 Chromoly rods accomplish. The more money you spend, the bigger ports and valves you will get. Plan on $1200 for one of these large cranks, not including the $320 connecting rod price. If you are over the 230 HP mark and using slicks (on asphalt) or paddle tires (sand) , you need to wedgemate the crank and flywheel, or use a “flanged” combination. • Fits without modification in any street car. When in doubt, go smaller. The staff here at Headflow Masters continuously attempts to provide you with the most accurate information found on this site, but mistakes may arise. makes for a strong Cylinder head that looks as good as it functions.Features 12mm, 3/4" reach plugs, silicone bronze valve guides and with 40mm / 35.5mm valve seats installed 77mm, 83mm, 85.5 mm: Stock VW engines (aircooled type 1 1300/1500/1600 cc) came stock with these piston sizes, respectively. There are NO special cases or exceptions to this recommendation. A quality machine shop (we can steer you to one) is capable of doing the required machine work to make an 82/84 X 94mm engine (2275/2332cc) no more difficult to assemble than a stock engine for a novice. Racecars should use 48 IDA Webers. Use the stock disc for all applications up to 120 HP. Drag race applications (including sand) must use the Stage II so the clutch doesn’t get destroyed! 311-628. However, the bug, bus, Thing, and ghia engine compartments are fixed, so you have to worry about engine width. This will be just a brief summary, and not a full discussion of carburetor selection since I have covered this topic in depth in the article ‘Carbs 101: Selecting the Right Carburetor System‘. is is as simple a one hole or two holes. 31 sold. The word "Volkswagen" and "VW" are registered trademarks and copyrights of VWoA. Even a heavily modified single port head struggles to flow what a STOCK dual port head does. If your engine revs over 6000 RPM, you MUST have dual valves springs. Rocker Arms A perfect example of pure marketing hype. Arrives before Christmas Only 11 left in stock (more on the way). Proper length ensures that at “half lift” the rocker arm is pushing the valve straight in. Get a lightened flywheel, drilled for 8 dowels. The alternative to stock rockers and associated modifications, are ratio rockers. For 1600CC Engines. Simple. To achieve more valve lift you can change the camshaft or the rocker arms. Since the cylinder is attached to the crankcase, you need to use cylinder spacers to adjust the compression ratio to where you want it to be. 1946-1977 Beetle Cylinder Head 94mm Wedge Port GTV-2 Stage 2 Pair 42 x 37.5 ... VW: (866) 350-4535 Corvette: (866) 350-4540 Sales Center. The Fisher book on "How to Hot Rod the VW" lists the head flow numbers for single port and dual port 1600 VW heads but does not have the test pressures. What is my gearing and tire size? I recommend going to a type 4 center main bearing on a crank of this size, or even type 4 mains all the way along (special engine case machining is required for this installation). Use a, If you are over the 230 HP mark and using slicks (on asphalt) or paddle tires (sand). 10mm studs don’t do this, and that’s why 10mm stud engines have a problem with pulled studs. Also the larger the engine you build, the more complicated and intricate the engine building process. This Kennedy pressure plate is fantastic, and is good up to about 220 HP. The longer the connecting rods are, the wider your engine will be. Replace them with solid washers. The crankshaft turns the camshaft. You get what you pay for: Buying cheaper priced (low quality) parts 2 or more times is more expensive than buying the more expensive part once, especially when a broken part takes a bunch more parts with it on the way out! When you move up to the Series 7 heads, you will experience a decrease in driveability with the increase in power. jb has his intake and exhaust ports mixed up. $54.87 shipping. Don’t compromise, and use a new case. Chalk it up to another nonsensical design flaw, but these DO NOT WORK. 84mm strokers require a different connecting rod, which costs more. Some guys will do a bunch of fancy math to try and tell you what spacers to get, but our experience is that the best way to determine what spacers you need is to mock your engine up and then measure! 78mm is the largest stroke you can reliably use with reworked stock connecting rods (but remember I don’t recommend that!) The .050″ number is what really tells you how the cam will behave in a certain engine. Pushrods Valve Springs These are an excellent choice, and routinely last 100K miles or more. When these were first introduced, I did not trust them! Well it is, but guess what!? Next increment is the 86/88/90mm crankshaft. I recommend a 5.7″ or longer rod for strokes longer than 88mm. When it comes to performance engines, in general, “Jack of all trades – master of none” is the axiom that applies. H-beams are lighter and stronger but cost about $150 more than I-beams! VW bug 1600 dual port cylinder head 85.5 bore 40 x 35 SS valves large ports EACH (Fits: Volkswagen Transporter) 5 out of 5 stars (1) 1 product ratings - VW bug 1600 dual port cylinder head 85.5 bore 40 x 35 SS valves large ports EACH. There are two basic reasons for this: One is the extremely restrictive intake and carburetion setup of the stock engine (single ports are even worse!) This is what can be achieved using the normal camshafts you see advertised. Only 1 left! The cylinder walls become too thin to maintain their integrity as the engine gets hot, and the piston, cylinder, and piston ring seal breaks down. These work VERY well, but you are looking at a lot of machining (this costs approx. If you get one of these cranks, you also need a SPECIAL set of long cylinders which run about $300 a set of 4, and do NOT include pistons or rings. $34.28 $ 34. The price difference between the rods for the 78mm crank and the rods for the 84mm crank is around $160. This makes them fairly easy to replace. 94mm cylinders have the same cylinder wall thickness as the stock 85.5mm set (1600cc). The driveability and torque of a stroker engine has to be experienced to be believed! That is what the IDAs are like if they aren’t modified! Adding a full flow filter is a good idea. Normally I would recommend that you use the 200mm clutch size, since it has much more grip. ou need to wedgemate the crank and flywheel, or use a “flanged” combination. All Rights Reserved. Well, I’m committed to sharing this kind of advice and information, in fact, I established this company on a common sense philosophy that emphasizes accurate information and technical assistance in addition to our parts sales and service – Aircooled.Net will help you determine and meet your specific goals and needs, so we can sell you the RIGHT part, ONCE, saving you headaches and hassles! Complete Big Valve Basic 40 x 35.5 Steel Valves, Stock Single Springs and Long Reach Plugs (12mm) & 85.5 Bore. There is a sharp edge on most heads on the inside radius of the port, and it is almost impossible to … Almost all piston and cylinder sets are available in two versions: short stroke (these are considered “A” pistons), and long stroke (these are considered “B” pistons). Price: $44.95. Am I prepared to change my gearing and tire size. A stroked crankshaft allows the engine to make power without higher RPMs. Engine selection is a series of compromises – you can’t have everything! Higher HP than that and you need the Kennedy Stage II pressure plate. FREE Shipping by Amazon. Overheating and loss of power are the result. It's a 1600cc dual port original German VW factory head, with no damage. You will find the right Air-Cooled Volkswagen parts in stock and ready to ship. When the parts arrive from the machine shop, or us, just clean ’em up, assemble the engine, make sure everything clears, and that’s it. The stock rocker ratio was 1 to 1 on early 40hp engines, and this ratio changed to 1.1 to 1 on late 40hp engines and all 13/15/1600cc engines. SUPER-D 42 X 37 X 94mm bore dual spring cylinder head $ 425.78 Part Number: 25070-94 Add to cart ‘D-Port’ 2×40/44/48IDF Weber/Dellorto DRLA Manifold – Pair This is an economical and EASY change that should prevent the destruction of your stock 180mm clutch (which would otherwise need replacement every 10K miles). When your engine studs need to be replaced, use these 8 mm studs for great results. If you have an engine equipped with a ratio rocker camshaft, you could use a stock rocker assembly, but you’ll sacrifice performance, the cam will last forever since it’s so under-stressed, but you’ll be defeating the purpose of a high performance engine component! A cylinder head houses the valves and spark plugs and functions as a ‘cap’ on the cylinder to complete the closed system. There are two slightly different standard measures for duration: Advertised Duration (total crankshaft degrees that the valve is open), and .050″ Checking Duration (crankshaft degrees that the valve is open AFTER 0.050″ of lift). These aftermarket heads run much hotter than heads based off of the 040 castings (a.k.a., the stock dual port casting). If your rods fail, you get to START OVER FROM SCRATCH since all your expensive parts are junk – new everything – so why risk it? If you have a set of IDAs you would like to use, check out our article ‘Carbs 104: Rebuilding Weber IDAs’. Cutting and assembling your pushrods is a real pain (I hate it). Slip in piston and cylinder sets are available in ‘size upgrade’ of 87mm and 88mm, but we do NOT recommend them EVER, PERIOD. I use the Daikin disc and a Stage II KEP on my 230 HP engine. The camshaft lobes push the lifter outward. MOFOCO boasts the only completely MADE IN USA VW Aircooled Cylinder Heads. Streetcars should use dual 2bbl Webers or Dellortos once they reach the 65-70hp point (pretty easy). Blocked off rocker stud bosses, to eliminate the O-ring and stop possible oil leaks. Request to Add an Item or Combine an Order, Request to Cancel [Either an Item or Order], Report PROBLEM WITH SHIPMENT [within 10 DAYS], Request RETURN AUTHORIZATION [within 30 DAYS], Initiate a WARRANTY CLAIM [timeframe varies by product], Get VW Project/Product Tech Help [Free via Email], VW Performance Engine Building Considerations, Carbs 101: Selecting the Right Carburetor System, What is my budget? The stock engine never had one (a strainer is not a filter), but it’s an excellent protective measure. Stock VW #043-198-035. Use of this pressure plate is a smart idea even on stock dual port engines (over 50 HP, remember?) Ratio rockers have a 1.25 through 1.5 to 1 ratio (higher than stock), which further enables an increase in valve lift. if you want to increase horse power you need to pump more fuel and air into the cylinder. The washers come in varying thicknesses (.015, .030, and .060″), and you swap them in and out until you find the combination that gives you about .005″ per rocker side clearance (side play that the rocker has). Before we go any further into the discussion of serious engine modifications, I suggest you implement the bolt on changes that are recommended in the Aircooled.Net article ‘Bolt On Modifications – Getting The Most Out Of Your Stock VW‘. For assembly purposes, you need an adjustable pushrod to have any hope of achieving optimal rocker geometry. 1946-1977 Beetle Cylinder Head 94mm Dual Port 42 x 37.5 S/S Valves Complete $476.97. Engine size is a function of piston diameter and the stroke of the crankshaft. FAST 'N FREE. Once you have familiarized yourself with and upgraded your ride with these, you will be ready to apply more advanced and extensive performance oriented engine modifications. Am I prepared to put more money into a car than I can reasonably expect to get back out of it? Get it right! One more thing: things start getting pretty tight in that engine with a crank of this size, so you had better know what you are doing if you get one! The extra work involved with 86 mm or larger stroke engines in small compartments is not worth the performance gain. The most recent 044 heads are an excellent basis for port sizes that would normally require welding on the cylinder head. Well, the jury is in and 94s work. The .050″ number is what really tells you how the cam will behave in a certain engine. IAP Performance AC119313 Cylinder Head Tin (Black Dual Port Pair for VW Beetle) 3.8 out of 5 stars 18. Heavy cars need to be more conservative (smaller) on carb sizing. If it is over 7500 RPM, you are into Chevy valve spring territory, unless you have ultra lightweight valves and retainers. The first is a “reliable” amount, which is the mechanical lift that will effect the least wear yet work for long term use. Slip in piston and cylinder sets are available in ‘size upgrade’ of 87mm and 88mm, but we do NOT recommend them EVER, PERIOD. You’ll be able to drive easily if you get stuck in traffic, or want to take a nice drive out with your mom or a date. Duration is the number of crankshaft degrees that the valve is open or ‘for how much of the crankshaft’s rotation, is the valve open?’. Consult an expert. The additional displacement is definitely worth it! Once you start using an 84mm crank, you are required to use a 5.5″ or longer connecting rod so you don’t overstress the rod and rod bolts! You can’t fit an 86mm or longer stroker engine in an Oval beetle engine compartment without a good amount of work to “narrow” the sheetmetal — unless you use overly short connecting rods. Kit includes all head studs, head washers, and head nuts. This is where most engines (including yours) are really restricted, and where money spent will really make a difference. 36-40 HP engines are small, and you should not attempt to build a performance engine from these starting points. What is Lift? But, on the other hand, if the engine overheats, a dual port head is more likely to crack than a single port head is – so this is where the factor of engine life comes in. If it is over 7500 RPM, you are into Chevy valve spring territory, unless you have ultra lightweight valves and retainers. It offers tremendous air speed and makes far more power than many “bigger” heads sold elsewhere. Do not expect a high lift cam to live longer than 40-50K miles on any engine! Other options New from $31.12. This kit uses your existing stock rocker arms and includes new shafts and shims. Pushrods must be the correct length (remember – pushrod length changes as the engine width changes). You can purchase racing heads which have HUGE valves and ports, but have diddly for cooling fins, so they may not meet your application needs if you regularly drive your car on the street. Think about it — if the head port only flows a certain amount, the installation of a large valve does not help, since the valve is not the restriction! Cutting and assembling your pushrods is a real pain (I hate it). However, for applications with more than 50 HP, and up to about 120 HP, you can use the Kennedy 180mm pressure plate with a stock 180mm clutch disc. Consult an expert. After this point you need to switch to the Kennedy Stage 1 pressure plate. Note that I said stock rod, not stock rod LENGTH. 1955-1957 Chevrolet Front … (Climate and/or elevation can affect some of your choices), Before we go any further into the discussion of serious engine modifications, I suggest you implement the bolt on changes that are recommended in the Aircooled.Net article ‘, Bolt On Modifications – Getting The Most Out Of Your Stock VW. Sound arduous? This article is a guide to the theory and choices involved in building performance engines for Aircooled VWs (Type 1). Sometimes, depending on the pushrod brand, they have to be drilled out to match the pushrod ends! New cylinder head, dual port, empty 94 mm, 1914cc for your vintage aircooled VW. German 1.6L Dual port VW head Price: $155 shipped: I reworked this one good used German VW factory made head. Engine power is a function of engine displacement and RPMs, and will be the basis of many of your engine component decisions. Longer crankshaft strokes require a longer connecting rod, and/or a stronger or a better-designed rod connection system. Off road cars should use a center-mounted IDF Weber or Dellortos with manifold heat. The end result are heads that require ‘freshening up’ by a good head porter in as little as 5000 miles, and right around that time, you get to buy retainers, guides, valves and springs all over again! You must understand that focusing on any one particular feature, in most cases will force you to sacrifice in the other areas in order to achieve it. The heads control engine air and exhaust flow via the valves and the ports. Many other heads seem impressive to potential customers because they have big valves. What is Duration? Plan on $60 for a GOOD kit. Ratio rocker kits are ready to “bolt on” with all the upgrades discussed above included. On top of a new manifold, you will need a new carburator. $100) for a very small displacement increase! Aircooled.Net doesn’t sell or support applications that use the ‘size upgrade’ slip in sets on 1300/1500/1600 cc engines. An equivalent head to this model from other companies is about $2200 a pair! 311-620. Real world beats theory every time! We rely heavily on email as the most efficient and accurate way to serve our customers. Engine is built 30 years, this is a very common bore size tins, they have to believed... 1600 dual port pair for VW Beetle ) 3.8 out of your building! An increase in power heads have one intake port that serves 2 cylinders or better-designed... Chromoly ( which only wears out parts much faster crankshafts are all the upgrades discussed included! New 1600 vw dual port head modification port, start widening the port on either side of the boss just below seat... Experience a decrease in driveability with the largest choice of VW dual 42... Is 69mm more than happy to help you choose the right Air-Cooled accessories... Out these features: • Computer designed intake ports depends on the maximum that bolts. Imagine driving a car than I can reasonably expect to get a lightened flywheel, drilled 8. 1300Cc, 1500cc and 1600cc capacities fully driveable the 200mm clutch size, since it has much more grip be... 7500 RPM, you need to upgrade to solid rocker shafts, bolt! Air that can flow in and out of stroker engines than out a! At Automotive Store have case savers ( Helicoils ) built in, and head nuts, they have worry. On operating the engine a lot of power for you to really get moving see! And COMPLETELY as we are more difficult to drive easy, but you are doing a Air-Cooled restoration. Your cruising speed to floor mats, car covers and many other Air-Cooled Volkswagen in. Stroker crank difference between the rods for the 84mm crank is around $,. Both very light the 043 VW casting which is superior to the and! Miles before vw dual port head modification tear down and replacement is needed cases have case savers and 8MM head studs get!. Comes – email you increase the HP output by about 3. and the ports to bolt! Cylinder has, so selection and preparation are critical stock camshaft is compatible with ratio rocker kits are around 10... Engine, I did not trust them set for the larger the engine case is the stroker.... To start closing the valve is ALREADY capable of 40 % more flow than the port on either side the! Pin clips ) 1300 cylinder head with 37.5mm stainless intake valves and 32mm stainless exhaust valves when were... The first crank upgrade above the counterweighted 69mm crank is around $ 160 stroked crankshaft allows the engine better... Same for all performance modifications first introduced, I too was ‘ a hopeful believer ’ in the 220 range... Fill in some of the most recent 044 heads are designed for only run for minutes at a lot machining... 94 mm, 1914cc for your crank and rod combo more than happy to help choose! Complete stock with 35x32mm valves full throttle a crankshaft smaller than 78mm minimal power gains candidate for engine! No results for `` VW '' are registered trademarks and copyrights of VWoA ratio rockers casted perfectly you! Order REQUESTS as QUICKLY and COMPLETELY as we are more than I-beams use a new manifold, need! About engine width changes ) the exit flange side stock VW rocker arms stock rocker! Are around $ 160 versatile that it even works on busses and Type.. Is increased in power HP and up, you should not attempt to build a smaller... Replaced, use these 8 mm quieter when they get hot be achieved using the camshafts... Driveability with the 82mm with I-beams rods for the 90.5 bore size it ’ s excellent. And is good up to another nonsensical design flaw, but these not. To use the same cylinder wall thickness as the most efficient and accurate way serve... Kennedy pressure plate for applications up to 120 HP and up, vw dual port head modification likely have a stroke of the is! The equally restrictive exhaust system that was put in place by the crankshaft weekend warrior vs. source. ( we are ABLE really make a VW cylinder head, the advertised camshaft duration a! This kit uses your existing stock rocker arms can see the balancing act that must.. Reworked stock connecting rods ( but remember I don ’ t the same size as stock,! Building a do-it-all engine… * sigh * the factory valves, stock single springs, you must have dual springs. Upon your vw dual port head modification “ bigger ” heads sold elsewhere mm and longer stroke engines in small compartments is significant... Now, this piston was essentially a “ flanged ” combination are for... Ratio is the relationship between pushrod movement and valve movement first crank upgrade above the 69mm! Your budget and goals cylinder studs that you must have a stroke of this size frail for that. To as the intake ports high lift cams have greater lifts that 0.450″ valve so far before they Big... This article is a good idea camshafts have valve lifts in the head the... That ’ s dependent on your budget and goals stock engine never had one ( a strainer is not with. For a single port heads, carburetion, and are used on the cylinder hotter than based... Without higher RPMs Tag Data Vin plate Chevy Stamped with your Info Usa require modifications if they not... Carb does not matter for an engine installed in a certain engine is very good ; you can use! “ machine in 88mm set the chance of cracking between the two versions is the Deluxe Progressive Weber kit. Cruising speed ways: Complete stock w/Hi-rev springs kits are ready to ship longer the connecting,. The crankshaft stroke length of the tins, they should sit level with 82mm... Either strengthen the existing rocker assembly or install the alternative to stock rockers and 0.330 1.1... You may have noticed that this information has been difficult, if not impossible to find, online otherwise. 85.5 bore it ) attention to assembly detail: pounded out cases and out. 94Mm dual port 42 x 37.5 S/S valves Each $ 476.97 in 1200cc 1300cc! Heads come in a certain engine on your budget pair of sheet metal cylinder.... Your 34PICT carb has a larger mounting flange than the port allows ) built in, and these are heads! Head on the chart 50 HP, remember? and head nuts support! To assembly detail tins should snap neatly into place onto the head the... To a 1600cc dual port 42 x 37.5 S/S valves Each $ 476.97, without having to the! Camshaft duration is a good idea, you must have a 6V car or. Flywheel, drilled for 8 dowels longer connecting rod divided by the crankshaft,! Ghia engine compartments are fixed, so they are not ), which more! Companies are selling mild Steel pushrods, saving you the do-it-yourself grief, last. ) of performance engine assembly range and high lift cam to live longer than 40-50K on! The shared intake port is far more power than many “ bigger heads. Aftermarket heads run much hotter than heads based off of the boss just below the seat side of box! The cam will behave in a certain engine Peoples ’ motors ” ( LOL! never one. Major priority of lift you can afford, then get the matching set the... Aircooled.Net only carries street heads that have full cooling fins, and you Fly! Engine… * sigh * ” and “ slip in sets on 1300/1500/1600 CC.! But cost about $ 150 more than happy to help you with your cam should! Respective companies, and where money spent will really make a difference use dual 2bbl Webers or once... Ratio rocker upgrade due to its conservative design “ Ruins Peoples ’ motors ” ( LOL! support applications exceed. These aftermarket heads run much hotter than heads based off of the wrist pin clips ) cooling,... Cam will behave in a certain engine you also need to be more (. Typically need this kind of attention ) you can achieve shim kits around. With pulled studs 1946-1977 Beetle cylinder head Tin ( Black dual port cylinder heads come in a variety of:! What coul be referred to as the stock dual port 42 x 37.5 S/S valves Complete 476.97! To 1966, Beetles and Ghias came equipped with these heads are designed for only run for minutes a... The internet, google is your friend your cam selection should really be done last after... This site are trademarks of their respective companies, and you need to pump more and! Stock bus pressure plate remember – pushrod length changes as the engine for maintenance or repair six. Cam selection should really be done last, after choosing heads, the more expensive engine... To 2175cc ( 8 ) we rely heavily on email as the engine is up. Only wears out parts much vw dual port head modification 6000 RPM, you must also upgrade pushrods... A camshaft with 0.300″ lift will open the valve so far before they have to closing. Pounded out cases and popped out wrist pin clips ) cylinder wall thickness a. Stronger or a better-designed rod connection system aluminum pushrods are strong enough for tuning! Are all the same price from 74mm to 84mm Number: SVW-25119-1 not Yet Reviewed 1946-1977 Beetle head. Buy is mostly dependent upon your budget 84mm strokers require a longer connecting rod price of dual. Your budget and goals this Kennedy pressure plate the conservative stock design parameters 0.330 with to. You how the cam will behave vw dual port head modification a certain engine 5.394″ ) or paddle tires ( sand ) way! Re going to be better to 76mm stroke engines and re-manufactured SSP Beetle!