0Vette Stripes

I currently have G5X2 with Patriod gold springs and the valve train is so noisy which I can hear some knocking at idle. I am not sure because of my old stock lifters or not.
While I am there to replace the heads for D1SC, would Comp Cam R lifters work best for my mods?
Thanks,
-Mike

hpcubed

I have a set of low milage comp R's and a set of like new crane OEM style lifters. Comp R's are a little more difficult to set up. Either type will work for you. PM me if interested.

0EG@EnglandGreen

I'm running Comp R lifters in Grond with my Godzilla cam

RED99

GM is suppose to have some new Hi-performance lifters, but nobody has them in stock yet. I have been waiting to get my hands on a set. Hopefully they will be available this week.

0Vette Stripes

Stephen,
Do you need any special setup or just basically replace the stockers?
Thanks,
-Mike

0Jeff @ TPE

I wouldnt run Comp R's unless you absolutely have to. OEM's, and Comp OE's are just as good. In most cases, ALOT of tuners reccomend against them.

RED99

Here is some info on those new GM lifters.

NEW GM Performance Parts Hydraulic Roller Lifter for LS-Engines

This new lifter will work in all LS- engine applications and is specifically suited for race cams and high RPM applications. They can also be used as an upgrade for stock lifters and are suitable for street applications. These lifters were developed for the CTSV Cadillac Race Team that used the “short stroke” LS7 style engines that raced in the Grand Am Cup Series during 2005. If you recall these engines were built using the LS7 block, LS7heads, and LS7 intake but the sanctioning body required the teams to meet the 5.7-liter engine size of 346ci. There were several different combinations tried but most of these engines used a stroke of approximately 3.200”. The demand to make race winning horsepower with a short stroke guarantees the unavoidable element of high RPM’s.
Initial testing, before these new lifters were developed, showed a definite valvetrain stability problem above 7000-rpm’s. Several remedies were tried, but in the end it was determined that the lifter had the biggest contribution to the RPM limit. This new lifter has internal changes made to the hydraulic components which resulted in a significant RPM increase. After installing the new lifters, these engines were now making power at 8000-rpm and they regularly saw 8500-rpm’s without any problems! WOW! The CTSV dominated the first races, not only did the sanctioning body enforce an RPM limit on the short stoke Caddies but they eventually implemented more restrictions to limit the horsepower on these LS7 equipped 346ci engines.
As a reminder, hydraulic roller cam valvetrain stability is a function of many different variables; camshaft design (ramp acceleration), pushrods, valve springs, rocker ratios, spring pressures, valve weight, the weight of all valvetrain components, oil pressure, RPM, etc. It is imperative that you have sufficient spring pressures, quality push rods and lifters, proper lash adjustment, and the lightest valvetrain components you can afford to maintain accurate stability at high RPM’s. Match your components to meet your RPM range!
We recommend a preload setting of 0.060” (cold) with these lifters, in most cases with adjustable rockers this is usually somewhere between 1-full turn and 1-1/2 from the “Zero-Lash” point. This is the same preload as a stock lifter!

0Jeff @ TPE

Not so much as "Special" setup, but they definately do require more attention than others when it comes to preload.

0Vette Stripes

Thanks y'all
I hope those new GM lifters are in the price range of Comp Cam lifters

-Mike

RED99

I believe they are cheaper.

0Vette Stripes

Thanks RED99
I'll wait for the GM's one first

-Mike