[04BlackSilverado]

Originally Posted by Mike Carr

If you wanted to run Stock, there are truck classes for factory trucks. Crate Motor Stock is also an option, using one of several IHRA-approved Crate motors. Both Stock Truck and Crate Motor Stock are for 1/2 ton or smaller trucks.

From the IHRA website:

http://www.ihra.com/competition/pistons.php Accepted Replacement Pistons

http://www.ihra.com/downloads/pdf/co...ateengines.pdf

I looked at the Crate class, and it looks like the only LS motor allowed is the LS1, which is smaller (ci wise), more expensive, and an aluminum block (again more expensive). The approved LS1 pistons are only for the smaller bore LS1 not the 4" bore LS2 or LQ9 Pistons.

I'll look more at the truck class...