General Category > Quadrajet Carb Talk and Tips
Suggestions For Next Drag Strip Testing Day
Cliff Ruggles:
I always use Rhoads on flat tappet camshafts as there are no negatives anyplace.
With the right cam you cam mimic the power of a very well chose Hydraulic Roller cam at much less cost.
I did a back to back dyno test on my last 455 engine between a 304/314, 231/240, 113LSA cam and a Comp HR cam with 284/296, 230/242, 112 specs. The roller cam had .361" lobes and a LOT more lift than the flat cam.
The roller cam only made 3hp/4ft lbs more power than the flat cam and done at 5400rpms where the flat cam made peak power at 5600rpms.
At the track the roller cam was worth more than the dyno showed, running about a tenth or so quicker for most runs and a solid 2mph faster.
Best run ever with the flat cam was 11.64 @ 116mph. The roller cam went 11.52 @ 118mph.
What the Rhoads lifter do is allow us to use a relatively large cam with less negatives, and have a variable valve timing set-up in an older engine design.
I've back to back tested them on the dyno against HT-951-R lifters and there is no power loss whatsoever from the fast bleed design.......Cliff
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