Comp cams has a service avail. they o/h roller lifters about $150.00

 

As stated above, the do unless they are the EndureX series. I had multiple failures of the EndureX lifters but I was running too high of spring pressures for them. If I did it again, I would go with a Crane lifter as they have fewer problems that I hear of through the grapevine.

 

I get really worried when I hear they want something back to study it, it means it is not perfected yet, I am sticking with solid flat tappets.

 

what do ya guys say about a solid roller in an LT4 spinning 7500 max. ?? just curious, is this a disaster waiting to happen? fully built motor.

 

FRC2000 - RPM kills motors. The shorter the stroke the more rpm feasable for the bottom end. I have lowered my rev limiter to 7000 because my cam is way over it's peak at any higher rpm and i always have those bad thoughts about things breaking.

As to the poster about not wanting SR lifters because they study them. I would say to you, "Stay out of any doctors office also. Because they call it a practice! " :smash:

 

Wally,

I know that the early roller cams were not all they were cracked up to be; but, I think new production methods, designs, and materials have changed that. As 69N.O.X. said, I am going to a roller cam for my L88. For the record it is the 138601 Crane roller, 296/304 advertised, 246/254 @.050", .615/.636 gross lift.

The Crane Pro lifters weigh 210 grams per pair with the bar. The factory Chevy flat tappet lifter I measured weighed 99 grams. I believe Crane said that each Pro roller lifter weighs 100 grams without the bar. I don't think the extra 5 or 6 grams will add tremendously to the weight of the valve train. I could probably make up for this by going from 7/16th's push rods to 3/8's.

Crane told me that although there are no guarantees, they would expect my pro roller lifters with the 138601 cam to last as long as a set of flat tappet lifters and hiperf cam. They claim to have the low rpm oiling problem fixed.

The benefits of the roller cam were made very apparent to me with my ZO6. I don't expect as smooth an idle with the 427, but I do expect higher vacuum at idle, less raw gas through the exhaust, less bucking while driving at below 2500 rpm through my neighborhood to keep the neighbors happy, and lastly, the goal of every BB Corvette owner, mileage higher than 10 mpg!

Chuck

p.s. It's driving me nuts viewing all the marvelous new goodies I have lying around but no time to install them. Spending less time on this forum would probably be a good start!


[Modified by Chuck Harmon, 11:41 PM 1/27/2003]