[gtofreek]

Originally Posted by Larry Navarro

did someone say lifter noise?
My old UD solid flat tappet had virtually no noise compared to the COMP hydraulic flat tappet in a previous engine. I set the solids one time after break-in and never had to re-adjust them.
I tried 3 or 4 times to set the valves on the hydraulic to get rid of the noise until I read the PY threads about COMP and "fast acting" ramps causing lifter noise on their flat hydraulics.
Of course hyd. roller lobe design is different than hyd. flat lobe design so the noise may not be an issue.

Yeah, Harold's lobes slow the lifter down at the end so it set's the valve down gently. Unlike the Comps. I've had some Comps that were just real noisy and nothing we did would quiet them up. Hyd. cams that is. Even with duration as mild as 210° @ .050. New lifters, 1 even 1 1/2 turns of preload, still noisy. We recently ran two Pontiacs with UD cams, both solid rollers on the dyno, one with .022" lash and the other with .026" and you can't hear either one of them. They're quiter than Comp Hyd. cams. I also like the broad, flat torque curves of the UD's.