Hydraulic Rollers

[jmracing]

JMRACING
Go with Comp Cams # 15850-16the best one for the price

[Rob Petrie E395]

I sent Chris at Comp a email and did not expect to hear back till tomorrow but he was able to get back to me tonight.
For those interested here is what he said about the 2 different lifters.


For a race engine the 15850-16 is best for a race application because it only has .030" of travel and it can take over 500#'s of open spring pressure.
The 875-16 has about .100" of travel and can take 400#'s open pressure.

[JRyan]

Jeff,

You can only run your '88 as a 138 HP engine with the .921" lifters. I'm sure there is great deal of latitude taken with the "Aftermarket OEM-type lifters permitted" statement by those who like to stretch the rules, but I was told when building our 138 HP Cutlass Stocker, that I had to use the "big" lifter, so we did.

Fortunately, they're able to be shimmed for limited travel, and unfortunately, they're heavy and require the 138HP roller block.

Jerry

[Andy G]

When checking the NHRA engine specs for the 1987, 307/138 olds I see that the diameter for these roller lifters is .698".
Is there an advantage to the smaller diameter lifter? I would think that that the larger diameter would be more stable in the bore at higher RPM. The smaller diameter would be lighter. Is the diameter a factor in choosing the better lifter for stock eliminator?