How much for bb chevy solid rollers?

JCPERF,
Your PM box is full.
Bob

All clear now.

When talkin weight, the Iskys are a considerable amount heavier than the Cranes. Are'nt the Cranes and Mercury's lifters all the same thing? I've checked the tooling marks and they're both the same. They even weigh exactly the same. Never had the chance to use the Morels, don't know if they're any better than the Cranes, but I would appreciate any info that anyone might want to give up on the comparison.
Also, can they live with valve spring pressures around #170-175 on the seat? If you want to turn 6500 rpm with any kind of a severly aggressive profile camshaft, you need that kind of v/s pressures with atleast 450 or better at v/o.

10x,

I am not certain what the spring pressure limitations are of Morel or Isky lifters. I can tell you that Isky told me to set my springs up at 140# on the seat and 400# open.

Yea they are indeed Morel. I set the springs up at 155 on the seat with no problems.

And I can pass along an outstanding deal on them.

If you quiz Isky enough they will tell you that the offshore guys are "getting away" with 160 on the seat.

Sutphen 30,
Sent you a PM
Bob

Yeah... That's what they all say, but only to extend the life of the lifter.
I tried 140# on the seat and about 385# at 600 lift, and with a mild (230-235) duration cam everything was fine till 5600 rpm. No matter what I did, the engines fell flat at 5800. End of the season I pulled the engines to make a few changes.When I lifted the heads to check the valve springs, cause I found signs of valve float, I found almost half of my valves were being pushed through the retainers. Some stems were flush with the locks. Bottoms of some of the roller rockers were hitting the retainers.
What a F'n mess. Bottom line here is no one expects you to run more than 5450 rpm. I think that's what the mercruiser rev limiters are set for at the factory. When you start going over those rpm's, those light v/s combinations can't handle it.
I had valve float so bad, it's a miracle i did'nt lose a valve.
After many lenghty conversations with a marine (offshore) technication at Crane, he finally gave up the truth on spring pressures, rpm's and longivity of hyd. roller lifters. And if you want to turn 6000+ rpm's and make the bigger hp, you CAN'T expect your valve train and especially hyd rollers to last. It cuts their life in half, at the best.
Now we run 175# on the seat, and 490# at 650 lift, and hav'nt had any valve train issue in 2 seasons.

10x,
Thats good to know. I set mine up at 150# closed and 435# open. I only have a 608 lift cam , 248* duration @ .050.

10x, Very interesting. I have always heard/been told that 140lbs on the seat and about 380-400lbs open were about max on a hydraulic lifter before the plunger in the lifter begins to depress. At WOT, I like to see my engines run out to a max of 5600-5800rpm. Very rarely do I take them up that far though and if I do it's only for about 30 seconds or so.