Bone stock the '06 and later motors make 290HP in full emissions dress. This is with TINY camshafts like 190 deg@50 and .400" lift... The head on this motor is really that good with a little bit of head porting - mainly on the exhaust side. Add 80-90 deg duration @50 and .100" lift.

We'll find out in Aug.. what a good NA LL8 is good for. And hopefully sooner for the turbo version..

Last edited by efi-diy; 04/10/08 03:16 AM.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them