be pushin around .. whats the rwhp and rwtq that most of the 408 strokers usual put around

 

with the proper MATCHING components, around 430-450rwhp and a bit more tq. it could be as low as 350rwhp with stock top end or as high as 480-500rwhp with race spec topend and huge racing cam

 

Mine isn't what i would call "race spec", numbers in sig are with stock throttle body and LS6 intake. I expect to see over 500 at the wheels after my 90/90 combo. But then again thats through a t-56.

 

cause a shop i went to said if i put like the L92/l76 manifold and head combo and with the right cam on the 408 im about to do he said it could be at 530 rwhp with a good tune..is this true ..? if so **** im all good with that kind of power

 

i don't think you'd see quite that much through an automatic. I'd say more like 500 with the right cam. The L92 heads from what i've seen are very sensitive to the camshaft selection.

 

For awhile, maybe.

 

from what ive read, the l92 need a whole different profile of cam. also most think they are great but i still think that regular cnc ported gen3 heads out perform them.

i like to give conservative estimates so people arent dissappointed when they dont have as much power.

not a whole lot of NA 408s here anyways

the auto will soak up the power anyways

 

Anywhere from 380RWHP to 500+RWHP. It all depends on how agressive you want to build it. A small cammed 408 would make around the low 400RWHP range and be a very nice daily driver. A 408 with a big cam, big flowing heads, and improved intake shoule be able to make 450-500.

 

What Zippy said.

CR makes a big difference as well. If you're still undecided about boost or not, hold off until you can firmly say: this will be an NA engine or this will be a boost engine. Otherwise you will build something in the middle and not have good performance either way.

 

I built mine around a set of 64cc chambered heads. It give me about 11:1 CR which is great for my N/A and nitrous plans now. But later down the road i could swap them out for a set of 72cc heads and different cam and have a somewhat boost friendly motor. I wouldn't be able to run anything crazy like 20psi, but a few psi would definetly be doable.