Comp Cams Pro Magnum Hyd Roller Lifters?

Like to hear from anyone who has ran them, either SB 8920's or BB 8921's, particularly if I can find anyone who ran the first generation ones that have a pressed in gold colored retaining ring at the top instead of newer ones that use a normal looking snap ring.

I've got a set of the 1st gen ones in my 448 & can not get them to quiet down no matter where I set preload...I had one that physically would not pump up no matter what, even after repeated cleaning & prep, & replaced it with a new style pair of 8920 SB's that I had laying around, & that fixed that one...

I've only ran Crane Retro Fit's in all the motors I've done in past & never had any issues with them pumping up or being noisy. These old style Comp's just seem to be a troublesome design. I've got a call in to Chris Mays @ Comp cams but am not expecting a return call. Comp does'nt have any of the new 8921's right now, so I don't have alot of options on changing these lifters out. Am trying to find a set of Cranes somewhere, which is what I'd really like to put in it because I know they will work, but that's proving difficult as well.

But just want to see if anyone on here has ran these old Comp's in the past & how they worked for you? The SB 8920's & BB 8921's use the same lifter body, just have different link bars, so experience with either would work.....

BTW Mike @ MM your PM box is full just FYI

Ryan, check your PM's.

Now it ain't!

The only other option currently avaiable is the Johnson hyd roller lifter. Scorpion bought them and are making them. They are pretty pround of them (price) but the Johnson stuff is very good stuff.

Mabey you just have too much spring preasure for them If you decide that is the case and want to sell those cheap PM me, mabey I can bum some more money from my wife.

Doug Herbert sells some for a very reasonable price and I have heard nothing bad about them.

I built a 426 street hemi motor last year and used the Comp hydraulic roller lifters, sorry I don't remember the part #. The first set was very noisy when set like Comp recommnended, even resetting them hot I ended up sending them back and the second set was noisy if I set the preload at 1/8 to 1/4 turn on the adsuters, I ended up tightening them up to 5/8 to one full turn hot on all of the adjusters to make them fairly quiet. They finally did quiet down completely after 700 to 1000 street miles

Mike, NOW you tell me about Scorpions LOL. I never would have thought to check with them on a set, as they don't offer much Mopar stuff. I just priced a set through Liberty & they are way cheaper than the Comp's or Cranes, so probably going to get a set in this week & check them out.

This is a mild hyd roller, it's got like 145 seat 350 open. Makes great power, just noisy.

CAB: that sounds exactly like what I'm experiencing.... I've tried pre-load all over the place, & 2 different pushrod lengths. It's now the quietest it's been set like Comp recommends @ aprox 1/8-1/4 turn preload. But it also now has ~60 miles on it & seems like it is getting hair better with milage. I hav'nt really pushed RPM limits yet, I think I had it around 5600-5800 last night a couple times, that's the highest I've had it. 75 PSI oil press, with stock lifter bores, non bushed. It's not an OS bore block.... The oil band in the lifter is lined up with lifter galley.... just bad internal design of the lifters. I see the newer Comps have dual oil feed holes (one on either side) where as these 1st gen Comp's have a single hole.

It seems like the plungers are sticking at certain times causing the lifter to act like a Solid.

Just irritates me, as I rarely use Comp lifter, but EVERY TIME I use their stuff I have a problem.. does'nt matter if it's a Solid roller, a Hyd roller, a Hyd flat tappet or a Solid FT, I've now had issues with them all. Maybe I'm just lucky, but I never had an issue running any type of Crane, in any of the motors I've ever done. Really wish I could just get a set of Cranes for it. Glenn @ GS will be re-releasing the Crane Hyd rollers eventually (after he gets the Ultra Pro line finished), but not anytime soon.

Picking up a set of Scorpion's this afternoon & will have them in in the AM, (thank God for INDY removable center valley tray). Will post my thoughts on them tomorrow, hopefully they work out well, pricing is right on them, & if Johnson is making them I agree should be good piece.

Was hoping to get car to test & tune on Saturday but dropped tranny pan this AM to swap it to Deep aluminum & found band material.... so time to install new trans as well. This stuff never ends....

Why not drill the 2nd hole in one of the old lifters and try it out?

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Why not drill the 2nd hole in one of the old lifters and try it out?

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Uh because I gotta return these pieces of junk & I don't think they'd do anything for me if I had modified them. The lack of 2nd oiling hole is not the "problem" The plungers are sticking.... The scorpions only have a single oil feed hole as well, but it leads into the oiling band in the center of the lifter so, it is getting fed constant pressure/volume.

The Scorpions are in & they sound 100X better, it still has a little noise (nothing unbearable), which I'm attributing to the movement of the link bars. The rivet/link bar design on the Scorpions are little "looser" than the Crane/Comps. Overall I'm pleased with the Scorpions, especially for the price....