gearheads78

Building a budget TPI motor with LT4 hot cam and Vortec heads.
I know its common to use the LS6 spring but everyone says to use the Comp retainers. Is there any reason I can't use the LS6 retainers I already have them and free is a lot better than $75.00 if I can use them.

Fast355

iTrader: (2)

Because the LS retainers are the wrong ones to use, the LS engines have smaller valve stems and valve locks are also different.

Comp 787 is what you want for a standard SBC Vortec head with LS6 springs.

Vader

You could also consider LT4 springs, 10° locks, and titanium retainers. Under a Benji for the whole lot:
12495494 https://www.gmperformancemotor.com/parts/12495494.html
12495492 https://www.gmpartsgiant.com/parts/g...-12495492.html
12495503 https://www.gmperformancemotor.com/parts/12495503.html

sofakingdom

iTrader: (1)

LS valve stems are 8mm (about .3149"); SBC are 11/32" (.34375")

Gotta use retainers that have the LS spring outer dia but fit your stems. Which is, Comp 787. There may be others but that's the one I know of offhand. There are no stock ones with the right combo of dimensions, obviously.