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Evolution

All our Evolution cams come complete with gear.

hq-0024
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HQ-0024    Rumble Stick

Bolt-in cam for use with stock springs. With good pipes and ignition we have seen 75 horsepower and 75 foot pounds of torque using stock heads and rejetted carb. Great bottom end and mid-range as well as lots of power on top. This same cam is used in our System 75 kit.

Timing specs measured at .053" tappet lift.
Intake    20/98/36     236   .500
" lift
Exhaust  51/106/19   250   .500
" lift

HQ-0029    Rumble Plus

This cam is for use with ported heads. Pulls progressively harder from idle to 6,000 RPM. Requires the installation of our HQ-2007 or 2008 spring kit. This is the same cam we use in our System 85 kit.

Timing specs measured at .053" tappet lift.
Intake    20/98/36     236   .580
" lift
Exhaust  51/106/19   250   .500
" lift

HQ-0023    Thunder Stick

Originally designed for ported heads using 1.900" or 1.940" intake valves, this is our best selling Evo cam. It has always yielded more torque and horsepower in a 10:1 compression engine than any other cam. Requires our HQ-2007 valve spring kit. We use this same cam in our System 95 kits.

Timing specs measured at .053" tappet lift.
Intake    19/104/47     246   .600
" lift                                                                             Exhaust  52/104/24    256   .530" lift