LQnotch

when buying them.. there are two styles for gen 3 and gen 4 correct? what changes the blocks or heads? i have a 99 block and an 05 or newer set of heads and not sure which ones to get.

any info would be appreciated thanks

jrpimp00

iTrader: (17)

Its the block that changes.

LS1MCSS

iTrader: (18)

Here's one sure way to always figure out which set you need. Stick a long skinny screw driver in the bolt holes and see if the big bolt holes are all the same depth.

NVR_SPDS

iTrader: (39)

Like was said, the blocks are different. The mounting locations on the heads are all the same. 97-03 had the different length, and 04-later have all the same length.

You can get anything thin and long, and check bolt hole depth just to be sure.

LQnotch

thanks alot guys

Blazeracer

iTrader: (2)

In particular, the outer two bolts on the upper row of HEAD bolts are a shorter than the other ten bolts. This excludes the top of of bolts above the lifters. Head bolts only, or studs if your running ARP's