dandrea86

iTrader: (13)

Im about to pull the trigger on a new motor build..car is a full weight 6speed. 3.90 gears out back. 50/50 street strip car.I am going with a 408 but am unsure on heads and intake. my goals are 500+rwhp with a mild cam. most likely upper 23x duration. I will also be spraying a dp 200-300 when i go to track to put up some good numbers. Will I be able to attain my goal of 500rwhp with ported l92 heads and ported l76 intake? I understand aftermarket castings such as AFR an TFS 225 will give me more power but the performance gains seen seem to be minimal when u look at the extra price. also is there any other engine builders that offer ported l92s besides texas speed? sorry for the long post

Gen414

iTrader: (38)

Bang for teh buck, almost impossible to touch the L92's. And yes, you can make that much power rather easily. I went by my machine shop today to drop off some more money for my motor, and they had a 408 on teh dyno. 11:1 on pump gas, Patriots, not sure on he cam, and it made 602 HP(flywheel). I do know it was a hydraulic cam though, and did not sound that nasty, pretty tame. These Gen III/IV just make stupid power

firefighting1101

iTrader: (48)

tfs will make the most power, with a fast 92 and then you can expect over 520rwhp!

sublime1996525

iTrader: (2)

Will TFS 215's work with a 408? I'm asking because I'm planning a 408 build later and don't want to buy another set of heads. They are dammed pricey! Lol

dandrea86

iTrader: (13)

anybody have anymore input?.....i see tons of people viewed thread but not many responses

NastyC6

iTrader: (77)

I have some heads that may help you achieve your 500rwhp mark. PM Sent!

Jason 98 TA

iTrader: (4)

For max power I personally would install our new PRC 237cc heads. That being said for budget the ported L92 heads are really hard to beat. You can get them setup with a stainless valve for the nitrous & still be under $1500 or so. If money was not a concern than the PRC 237 head will make big power & fit with a cathedral style intake.

http://www.texas-speed.com/shop/item...d=992&catid=40

http://www.texas-speed.com/shop/item...d=697&catid=40

GrannySShifting

iTrader: (10)

People will make a million suggestions, look at combos that work and go from there. If you want to keep it simple, I like the LS7 manifold based stuff as its the best for what it can do with simple packaging. Can feed 600+ rwhp NA in a 6 speed, weve made 530 in a TH400 on mustang dyno.

Plenty enough to get you in trouble

GrannySShifting

iTrader: (10)

Biggger nitrous hit, you dont want stock castings period.

bww3588

iTrader: (49)

i've heard that too, with a 300+shot, stock castings will start to lift. i was advised to go with TFS heads over LS3/L92 heads, because i plan to shoot 350+