what rotating assembly

302stang87

Forum Member
hi i have a set of afr aluminum 170 cc heads and .40 over 351w block, im looking to build a twin turbo car
what do i need to turn this into a 408 stroker that will work with my heads?

the heads have
Trick flow 170cc Twisted Wedge Track Heat Cylinder Heads As-Cast For SBF 289,302,351w

600" max valve lift

Dual valve springs "Seat pressure 125.lbs, Open pressure 325.lbs" Chromoly Retainer's, 10° locks
and has full roller 1.6 rockers
 
Not enough head. Need atleast a 205 if not a 225 depending on turbo and power wants. You can get the heads worked on and open them up and just run it as is .040 over with a pair of small turbos. Those heads i would throw on a 8.2 block with a single 76. Be good for about 550HP +
 
You can use them but as billy said there gunna be a restriction, I would also leave the cubes small and just size turbos acordingly or find a larger set of heads... If your going turbo you can have alot of cylinder head and "fill them" with the turbos...
 
okay, well i got rid of the heads lol too many people told me they were too small for what i need, im lookin to stick around the 408, im looking for a cam and head combo along with crank also... i found the turbos and they are turbonetics y2k series turbos theyre good for 1200 hp a piece, ive only had 306 spray engines b4 trying my hand at a turbo car for grudge racing... first of all will the block hold the power i wanna put to it dont wanna waste all of this on a block that wont hold up to it... its a 69 351w being sent to the machine shop this week! so i need as many opinions with all of this as possible im building motor first then comes all the chassis and trans work... and would i be able to just run with a built c4 or do i have to go glide?
 
doubt a c4 will handle what your talking about and I wouldn't use a stock block for a big twin turbo build. I also wouldn't build the motor first lots of money gets tied up in doing suspension and chassis work. Learned that lesson with my 86 had a motor built ready to go and work got slow and it sat for a year while I tried to get the chassis finished.
 
yeah, i understand where youre coming from but im not expecting to be out this season at all im thinkin more of the end of next season... and stock block why not? cant handle the power? also what trans would you recommend? and one more thing im about to order a tubular chromoly k member from team z with the coil over kit but idk what spring rate to get... i am a retard when it comes to suspension shit i may end up jus taking the damn car over to team z and have them do it all but who knows maybe i can a few friends who know what theyre doing to help me out... i appreciate you guys givin me advice!! someone i know keeps tellin me afr 225's would be perfect for this turbo set up how much truth is in that? its goin to be a 408 stroker im having troubles with cam intake and head choice, i was wanting to go with a lunati cam if you guys have any ideas feel free to fill me in!
 
with the cam im not sure what lift to get? i keep hearing the bigger the better but not really sure how true that is
 
btw its gonna run off of e85 i was told by brad ohara at ohara automotive that e85 is actually 113 octane not sure how true that is but if thats the case then it will be a e85 car but if thats a false statement then im jus goin to spray the piss out of it and hold on
 
E85 has an octane rating higher than that of regular gasoline's typical rating of 87, or premium gasoline's 91-93. This allows it to be used in higher-compression engines, which tend to produce more power per unit of displacement than their gasoline counterparts. The Renewable Fuels Foundation states in its Changes in Gasoline IV manual, "There is no requirement to post octane on an E85 dispenser. If a retailer chooses to post octane, they should be aware that the often cited 105 octane is incorrect. This number was derived by using ethanol’s blending octane value in gasoline. This is not the proper way to calculate the octane of E85. Ethanol’s true octane value should be used to calculate E85’s octane value. This results in an octane range of 94-96 (R+M)/2. These calculations have been confirmed by actual-octane engine tests." [18]

Examples of this mis-citation can be found at the Iowa Renewable Fuels Association titled "E85 Facts"[19] which cites a range of 100-105, and a document at the Texas State Energy Conservation Office titled "Ethanol"[20], which cites a 113 rating.

Use of E85 in an engine designed specifically for gasoline would result in a loss of the potential efficiency that it is possible to gain with this fuel. Use of gasoline in an engine with a high enough compression ratio to use E85 efficiently would likely result in catastrophic failure due to engine detonation, as the octane rating of gasoline is not high enough to withstand the greater compression ratios in use in an engine specifically designed to run on E85. (However, Flex Fuel Vehicles are designed to run on any mixture of gasoline and ethanol, from pure gasoline to E85, and avoid this problem.) Using E85 in a gasoline engine has the drawback of achieving lower fuel economy, as more fuel is needed per unit air (stoichiometric ratio) to run the engine in comparison with gasoline. The additional ethanol required for a stoichiometric fuel ratio helps compensate for lack of energy provided by ethanol's lower heating value (LHV), which is lower than the LHV of gasoline.

Some vehicles can actually be converted to use E85 despite not being specifically built for it. Because of the lower heating value E85 has a cooler intake charge—which, coupled with its high stability level from its high octane rating—has also been used as a "power adder" in turbocharged performance vehicles. These modifications have not only resulted in lower GHG emissions, but also resulted in 10-12% power and torque increase at the wheels. Because of its low price (less than $2.00/gal in some places) and high availability in certain areas people have started to turn to using it in place of high-end racing fuels, which typically cost over $10.00/gal.

E85 consumes more fuel in flex-fuel type vehicles when the vehicle uses the same compression ratio for both E85 and gasoline, because of its lower stoichiometric fuel ratio and lower heating value. European car maker Saab, now defunct, produced a flex-fuel version of their 9-5 sedan, which consumes the same amount of fuel whether running e85 or gasoline
 
Just tell dave what you'll have in the front he will tell you what spring rate to use he has done enough cars he can get you real close if not right on for spring rate by your setup.
Trans I'd go with a glide or a turbo 400 my Sn95 is setup for a turbo 400.
 
turbo 400? hmm never heard of that trans, who did your trans? ima need a trans shop to go thru and do a few things.... is a glide heavier or lighter then a 400
 
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