brians91formula

iTrader: (12)

Aftermarket heads ( PRC, TFS, AFR ...etc ) usually make more power than worked over 243 casting heads. Especially on stroker setups.

blackls1ta00

iTrader: (27)

ive had afr 205s on my 383 it did okay at 460whp i think these carteks will do more at 238cc

brians91formula

iTrader: (12)

Did you ask Cartek if these would work well for your 408?

smok'nZ

iTrader: (160)

not always true about aftermarket casting. a buddy of mine has a set of #243's that out flow tfs 235's in all areas he has under 2000$ into them as well with valves and springs

but if you dont know a great local head porter you cant go wrong with AFR or TFS not a fan of prc my self but tony mamo and brian tooley are both top notch

Tainted

iTrader: (9)

I wanna see proof some ls6 castings out performed some tfs 235. The fastest lsx runs tfs 235 still as far as I know.

blackls1ta00

iTrader: (27)

yes i talked to cartek they said they shud do good on a 408 n/a with nitrous lol

98blueSScamaro

iTrader: (14)

proof well if a little ls1 stock bore and all can do 495rwhp on my set and 500 plus on alex's car i would say there 238 intake runner will really do well on a 408. just saying.

blackls1ta00

iTrader: (27)

good overall power is what i want, since its still a street car,if i could afford mast heads i would lol

Jimbo1367

So how accurate where the bores? What about that pistons? What brand of measuring instruments did you use? I've NEVER heard anyone boring/honing a block BEFORE having the pistons in hand to measure first.

98blueSScamaro

iTrader: (14)

good over all power hhhhmmmm should have done a turbo build for cheap then. stock heads 234's or 799's would have done the job.

blackls1ta00

iTrader: (27)

ill try the 243 carteks and see what happens

Tainted

iTrader: (9)

Gm castings will perform well especially for the money. But to clarify, I dont care who has worked the castings, an aftermarket head will out perform them. Its not all about peak flow but area under the curve as well. Now whether or not the gains for the money are worth it to you is your choice. But to say gm heads are better than a comparable set of afr tfs etc is flat out wrong.
Someone feel free to prove me wrong, and not by comparing a 238cc head against a 205cc one.

98blueSScamaro

iTrader: (14)

Your wrong!!!!! Stock castings with valve jobs good valve jobs perform. There is a lot more to it. Super stock guys net close to or over 600 fly wheel hp. With stock heads and no port work just valve jobs and milling

Tainted

iTrader: (9)

And I didnt debate that. I said show me where a gm casting out performed a comparable aftermarket head.
Im well aware of the power people have made with gm castings

bozzhawg

http://www.gmhightechperformance.com...h/viewall.html

Tainted

iTrader: (9)

Thats square port vs cathedral

blackls1ta00

iTrader: (27)

ok well lets keep the arguments to pms please on my thread thanks

blackls1ta00

iTrader: (27)

been kinda slow on getting the engine finished hoping soon tho

blackls1ta00

iTrader: (27)

finally got some new parts,gm head gaskets and granetelli plug wires from summit

blackls1ta00

iTrader: (27)

kooks 2" race headers im impressed one step closer