gearheads78

iTrader: (29)

Putting a budget TPI car together using the LT4 hot cam with L31 heads. I have a set of LS6 Springs and retainers. Everything I read says use the Comp part number for the retainer. Is there a reason I can't use the stock ones I know I have to use the standard keepers.

TT427

iTrader: (1)

biketopia

iTrader: (5)

I have this exact set up (vortec heads, hot cam, 1.6 rr,) you need the comp retainers. They give you a good bit of clearance on the seals, I used another type of seal I found in some internet searches I can dig up if you need it. The bigger thing though is when using 1.6 rockers the comp retainer gives you a good bit more clearance before hitting coil bind.

Edit: Sealed Power Part # ST2015 are the valve seals I picked up, haven't had an issue with em yet.
and this https://www.thirdgen.org/forums/tech...ortec-lt4.html is the thread i got my part numbers from.

gearheads78

iTrader: (29)

thanks man

biketopia

iTrader: (5)

Happy to help

Fast355

I used Comp 787 retainers and LS6 springs on the 906 heads on my Express van. Make sure to get the 0.050" offset retainers. They help with the LS6 springs installed height and keep you out of coil bind with the 1.6s. LS6 springs coil bind at ~0.600 lift and you lose about 0.100" on a Vortec head of installed height compared to a LS. With the offset retainers you are usually good to 0.550" lift with 0.030" to spare.

biketopia

iTrader: (5)

Interesting, thanks for posting that, I didn't realize they were an off set keeper. I had read to use those, or the stockers, but no reason why. Didn't really dig into it much after that but it makes sense. OP if you can swing it, I'd suggest the keepers too, with the hot cam and 1.6 rockers I'm on the ragged edge of coil bind spec.