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#11
09-24-2021, 02:57 PM
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474ci engine running a set of 290cfm CNC ported KRE D-port heads with a 236/245 duration hyd. roller cam.
SD Performance dyno testing with a stock iron intake running a Cliff's Q-jet. After some tuning, ended up with 515hp @ 52-5300rpm and 575 lb/ft @ 4000 rpm. The next intake was another cast iron unit but with the CNC machined plenum copied from Cliff's personal intake. With some minor tuning it ended up with 527hp @ 5300rpm and 579 lb ft @ 4100rpm. 4 lb/ft lbs gain at peak torque rpm. Not stated is the improvement if any at a lower rpm, or off idle response and lower rpm drivability. Nor any track improvement. That would take a very consistent vehicle with back-to-back testing. Street only use, probably very little difference. . .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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