Cam72aro

iTrader: (28)

I have a 2000 ls1 and am wanting to do the trex cam and prc dual valve springs. My question is, do I have to machine the spring seats in the heads for these springs?

BIG_MIKE2005

iTrader: (116)

Not that I know of. I just bought a PRC double spring & pushrod kit from TSP. Jon never mentioned it to me & we talked about it for a while before we decided it was the right kit for my cam. I'm very impressed with the quality of the kit also.

99blancoSS

iTrader: (115)

You should call them, I dont think they are direct drop in replacements

777

iTrader: (21)

They are. I've been running them for 20k miles. You have to get the kit w/ the ti retainers, as your stock retainers won't work. But there is no machining needed to the seat.

Zach@Texas-Speed

iTrader: (7)

There is no machining involved with installing the PRC dual spring kit. I've have mine on the car for ~20k miles as well and still perform the same as the day they were put on the car. Best spring for the price IMO

If you guys needs some pricing on the kit, shoot me a pm!

-Zach

Robinator

iTrader: (1)

TR told me with that cam (T-rex) you have to use a .030 shim with the dual valve springs.

Cam72aro

iTrader: (28)

What about running the ms3 cam with these springs?

BIG_MIKE2005

iTrader: (116)

The MS3 has specs close to mine & I also talked to Jon for a buddy who was lookin @ the MS3 & he said this kit would work for it also. The kit is worth it, it comes with new locks, tit. retainers, pushrods, double springs, etc...

bigdsz

iTrader: (1)

I think those springs are good for a .650 lift and the tRex is .61X lift, but I would check coil bind FWIW, if you are shimming.

Robinator

iTrader: (1)

PRC's are good to .660 lift

Zach@Texas-Speed

iTrader: (7)

Jon uses them on his .650 lift cam in his 408 and hasn't had any problems at all, no shims

777

iTrader: (21)

I thought platinum's were .670 lift max. Anyhow they are a nice piece and will work perfectly for the cam

Joker

I daily drive these springs on a TSP 242/248 cam with .625 lift, no machining needed at all, great product at a great price.

98A4LS1

iTrader: (1)

^^^ Same here, daily driver, no machining spring seats nor did I need to use shims. Nice kit for the price from TSP!

john59

iTrader: (2)

Great Spring!!

DocEwww

iTrader: (1)

bump...Ive heard this also. Is this a must with the Trex?

GuitsBoy

iTrader: (4)

Like all the others said, great spring kit. Direct fit.

DocEwww

iTrader: (1)

Bump. Is this a must?

MiaSSmaro98

iTrader: (9)

good stuff no mods needed

4mula

great springs!