408LS1TA

Today the 408 short block finally came in. Tomorrow it'll get put on a stand and topped off with AFR 205 heads that've been opened up for the larger bore, and milled .08" or so. Cam specs 244/248 .612/.615 115lsa. It'll run an LS6 intake for now, stock TB, 1 3/4" long tube headers, 42# injectors, 255LPH fuel pump, etc. The car is an AUTO currently with 3.23 rear gears.

Any guesses as to the power this will be making?

I just can't wait til it's done....

ls1wannabe

iTrader: (2)

I would say 440 to the wheels, but you are leaving alot on the table a 90/90 combo would do you nice, do you have a pulley?

Fr33styL3

whats the c/r?

i would say 440whp at the min.

might want to look into 1 7/8LT's and like wannabe said fast 90/90

2001 Pewter WS6

iTrader: (43)

He should be alot higher then that. I would say 480-490 at the wheels. I pulled 460rwhp in my old 383 with the LS6 intake and TB with a 236-240 cam. I also had a Moser 12bolt with 4.10's...

destroyerSS

iTrader: (2)

I would guess about 475-480

408LS1TA

C/R will end up being around 10.2:1 or so... and yes, I have the ASP underdrive pulley. PRC dual springs, Comp 850 lifters, etc etc. I realize the LS6 intake & stock TB aren't exactly ideal for moving tons of air into the motor, but I'm flat out of money to spend on this at the moment. This spring will be a different story, though.

BlueSix

with the comp. ratio being that close to stock i'm going to guess 460 rwhp.

All the 500+ rwhp dyno's i've seen are on cars with 11.5:1 and greater.

Rhino21149

We have a 408 (Horsepower Engineering short block), 11.25:1 compression with the big-port AFR heads, 1 7/8" Kooks headers, 254 deg cam at .650 lift, 42# injctrs, underdrive pulley, etc. in an M6 Camaro with a 3.73 locker rear axle.

With the LS6 manifold and stock ported throttle body it produced only 470 RWHP at 5600 RPM, but starved for air above that.

FAST 90 mm and TB opened it to 510-515 @ 6500 after a lot of tuning.
We can probeably get more if we add octance booster and tre-tune but we run on pump gas for now.

Mike K.

I guess between 510 hp and 540 hp.

Worm

iTrader: (2)

470-480 thru the auto.