Quote:
Originally Posted by FUNFER2
What were the specs. on the three cams ?
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482 ci FE with TWM injection:
Intake Exhaust
Gross Valve Lift 0.645 in 0.635 in
Advertised Duration 304 315
Duration @ 0.050 in Lift 242 248
Lobe Separation 112
383 ci Blown and Injected SBC:
288/294 adv. duration and .520/.540 lift, LSA 110 degrees
duration at 0.50" - 236/242
I don't have the specs handy on the first motor (it was a 355 ci blown SBC) but I'd say it was similar to the previous motor with a little less lift.
The first 2 motors both make over 600 HP and 600 ft-lbs on pump gas. Both are very streetable. You can check out the dyno runs (torque and HP curves) on our website at:
http://www.anitafred.net/HotRod.htm
Note the wider LSA on the TWM injected motor. This is I am sure, in part, to limit overlap at low RPM to keep intake reversion under control. This would likely be a big problem on the large FE with its big valves, short intake runners, and big TWM stacks.
Again, its subtle stuff like this which makes it difficult for the average guy to "pick their own CAM" and really get the best possible performance. If you want to get some idea of what is involved in really doing CAM selection correctly, check out the following book (its excellent):
How to Build and Modify Chevrolet Small-Block V-8 Camshafts and Valves
by David Vizard
I hope that this helps you.
- Fred
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