I say ~420 also...I also think getting over 400 with the stock pistons and rods 4.8 means you may not have 4.8 for long. Good luck. I really need to change my name now.

 

ok, you got me with your old numbers, my best hp was 387, now where are your new numbers?

 

How much compression are you losing with the thicker head gasket?

 

Low right now we think the engine is at about 10:1. We would like to think it would get down in the 9.5:1 or lower range but we really cant tell yet. What is the most power that anyone has seen out of a LS1 with stock internals???

 

you should be more around 9:1 comp I would imagine being a stock 4.8L and using larger cc chamber LS1 heads

The highest hp stock internals LS1 (5.7L) is somewhere around 600rwhp I don't think things last too long in that range though -even with a dead on tune.

 

[QUOTE=Ryan23silverado] you should be more around 9:1 comp I would imagine being a stock 4.8L and using larger cc chamber LS1 heads

Ryan i honestly am not sure what the comp ratio is. Agestino Racing did the heads and they said they are 9.5:1 or 9:1. I thought that they said 10:1 but when i went back and looked it was 9 or 9.5. I would like to have it be right at 9: or even lower. as for the stock internals lets just say that once they go something forged will be waiting to replace the whole set up.

 

[QUOTE=LTNKLR01]

when do you get the dyno results?

 

you got a stall or still running stock converter? i'd say ~450hp

 

Blown: it will be about a week to 2 weeks before i get the results. I told my mechanic no rush on the truck seeing as how I live in NEw England and it is winter so that means cold, wet roads. But as soon as i know the results you guys will.

454: I have a yank 3000 stall convertor

 

Cold, you think its cold!!!!

Its a freezing 62 here!