Wanted to share some info I found.....for those of you that have experienced this sewing machine sound that doesn't want to go away


The XE or "extreme energy" cams are fast ramp cams that take maximum advantage of the lobe ramps that are possible with a hydraulic roller cam. This offers a power advantage over more milder lobe ramps. The XE cams will tend to make more noise than the milder ramp cams - this shouldn't be surprising to anybody. Because of the cams fast ramps, the cams will tend to sound like a solid lifter cam. If you look at the duration at .050 and then look at duration at .200 on Comp Xtreme energy cams and compare it to others, you realize that the comps have extremly fast lobes.

Comp Cams says that 'you will hear the valves open and close more'.

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347 Stroker/XE284H(284/296 dur, 240/246 dur @ .050), BG 650 VS Speed Demon, Ported Victor Jr intake, Jack Roush World Jr Heads (ported from 180cc to 195cc)(upgraded to 2.02/1.60 valves) 260cfm/190cfm @ .550 lift, 11:1 comp...309rwhp for now:):)