These threads remind me of the test that Don Johnston did a couple years back. A lot has been made of different oil pressures, oil band heights etc.
Dons test seems to show that it’s more of a QC issue. With a CC lifter in the bore, they leaked quite a bit of oil from the cup. Meanwhile the Crower hyd roller leaked very little from the cup.
I have noisy Lunati (morels) lifters and while I’ve not had reliability issues, the clatter sucks and depending on joe they are behaving, the engine behaves in tandem. The louder they are, the less power the engine makes and the sooner power drops off. If they’re quiet the engine will run to 6000 without even thinking about it and feels a good 30-40 hp more.
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-Jason
1969 Pontiac Firebird
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