SBM Roller Lifter Choice
Whenever you the your Comp lifters out, it'd be useful to know if you have the "flat" lifter or the "smiley face" lifter, referring to the body over the wheel. This is a "flat" and a "smiley face" dips down like a smiley face. It's very apparent which is which.
I don't have a lifter recommendation, but I have looked a bit into the problems with these lifters. I'm using the comp retro-rollers in my own engine and don't think the noise is excessive at all but that doesn't mean you're experiencing the same thing. I'm running a custom ground cam with specs similar to the 20-811-9 grind with .536/.544 lift with 1.6 rockers.
I'm not saying this is your problem, but at rpm this may cause enough bleed off to cause problems with the lifter pumping up properly-
What I've found is the mopar block's oil gallies are drilled from the four corners (see pic for detail) and rarely meet in the middle. In some cases, with high lobe-lift cams, this pushes a roller lifter far enough into the bore that is offset enough that oil is bleeding off from the gallies from under the wheel. There's only so much lifter body that can cover the wheel. I haven't checked any other lifters, but comp's lifter manufacturer for that lifter uses similar body styles for a range of lifters, changing the link-bar for it's different applications. There's very few actual lifter manufactures so I'd check their body style and take that into consideration when choosing your next lifter.
If you have a chance whenever you can get your engine apart, you should look through the oil gallies and see how off they are. It may get super picky with roller lifter choices.
Also, what oil are you running?
This is the mismatch of the oil gallies.
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This picture I pulled the lifter up to exacerbate the issue. You can clearly see the bottom of the lifter. Flat tappet lifters would have no problems but add a roller and it can become an issue.
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This is for a one of the worse off blocks I looked at, but the arrows are where the gallies were drilled from and you can see how it affects the lifter.
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Hope this sheds some light, if this is a problem solids would help as it wouldn't bleed off enough to disrupt engine oiling, just enough maybe where it mattered to affect the hydraulics. And again, this is what I might think is a good explanation, as I have no problem with these lifters on a similar setup.
Whenever you the your Comp lifters out, it'd be useful to know if you have the "flat" lifter or the "smiley face" lifter, referring to the body over the wheel. This is a "flat" and a "smiley face" dips down like a smiley face. It's very apparent which is which.
