I'd say go with the SLP heads kit. As soon as I'm done with my LT's I"ll be around 425-430 which is their advertised 500hp. I don't know what cam you'd go with after that though. I would have gone slightly bigger if I had to do it again.
they are the same part numbers that rmr has posted on the gtodrift site i had the parts guy run them i thought 540 for the cam was high 2 but it comes with lifters and the heads are complete i dont know what i wanna do but i want a all motor beast im thinkin of maybe pickin up a ls1 and buildin it to the hilt but rmr claims 490hp with the gm heads part #s 88958665 and cam #12480110 i talked to a guy there and he said thats all thats done to it is those parts im kinda skeptical of 140 hp from heads and a cam and he said they used stock injectors i think he wanted to blow me off but any info will help at this point i want a all motor running 11's
AFR 225cc heads are due out soon. Big cam paired with 225 heads is estimated to make 500rwhp (bolt ons and headers are needed too.) But the AFR 205cc are getting alot of attention, what can't you like about them?
I dont' think RMR is running a hot cam, could have swore they are a running a '02- LS6 cam.
Big cam dont mean jack really. 225 heads would be too big on a stock motor. I'd only put them on a 382C.I. motor and bigger. The AFR heads have not really been throwing down crazy numbers. Airflow on a 346 N/A motor doent mean much if there is not enough velocity. On a Forced Induction setup or huge motor the airflow is needed.
Im just going by the gtodrift site my car sits stock now and i just dont know about the ls1 aftermarket im reading everything i can and getting everything i can this is going to be my first injected performance car so thanks for everyones inputs
i liked the idea of the gmhpp because i can install them mysefl at my work and they still be covered under warrenty
Sure you wern't looking up regular RPO LS6 heads? Talked to the chevy parts guy I know told him the part numbers.
88958622 GMPP CNC ported $930 each (good guys price) This is the head run by RMR.
88958665 same head as above but 62cc chambers
12564824 RPO LS6 head $680 each my price.
RMR has estimated the engine in their GTO is making 470hp (flywheel) which for ported heads and headers on an LS6 sounds reasonable.
FYI the GMPP heads are ported by LPE. What I don't like is that they break through the top of the casting while porting and weld them back up. Do a search on the corvette forums, this has been discussed quite a bit over there. When it's time for heads/cam on mine, I'll be using a Cartek setup. They have seen over 500 RWHP from h/c with a stock bottom end and hold the heads/cam record in a Z06([email protected]+). The aforementioned car belongs to a forum member here who just picked up an IBM 04 GTO(BrentEB02).
i had my guy run the part numbers and thats what he gave me for prices i get it atr cost so that might be the difference and yes i was aware of the fact they weld the ead back together sounds kind sketchy but lingenfelter is a name u can trust and ill hit up a vette forum or 2 thanks