Two fbodies battling it out.

[ScreaminRedZ]

@jdaniels

“LS6” intake manifold and cam change were the only substantial differences. Casting #'s are different on the heads but the actual design is identical (just like 799 and 243 heads are the same). The 01+ LS1 uses the LQ4 cam which is actually SMALLER than the 98-00 cam.

The improvement in power on the 01/02 cars is probably due mostly to the LS6 intake.

@jdaniels

For M6 cars the base axle is 3.23 with 3.42 as the performance option.

I’ve never seen or heard of a 6-Speed LS1 with anything other than a 3.42. I could be wrong, but I don’t think there were any other options.

@jdaniels"

but maybe that catted Y is choking it.

It’s possible. The high flow cats on my heads/cam Z28 lost me 8 rwhp vs off road pipes.