My stock 58,000 mile 7.77:1 SCR 350 in my 1975 Formula is internally stock with the exception of recently added 1-3/4" Hedman 4 tube headers and 2.50" mandrel exhaust with a #42585 Flowmaster Crossflow. The Q-Jet and ignition curve was modified. I am experimenting with this engine will the 412 roller motor is completed.
When I bought the car in on July 11, 2005, it had just passed the California Smog Inspection and had only 44,000 actual miles. I had the car dyno'd in this condition to give a baseline for future modifications.
The test was conducted at 66°F ambient temperature and 77% relative humidity. The ambient barometric pressure was 29.98in/Hg and the elevation at the test site was 100' ASL. The operator estimated a 22% loss factor.
The results were 146.8 RWHP @ 4200 rpm and 204.1 lbs/ft RWTQ @ 2700 rpm.
The car is going to the chassis dyno again August 25, 2007 for some new baseline pulls to show what improvement was (or was not) made with the addition of the headers, exhaust system and tuning modifications. Following that, a set of 72cc #15 heads will be installed to bring the SCR up to 9.12:1 and a custom ground hydraulic flat tappet with .467"/.467" - 220°/226° @ .050" - 111.5° LSA will be fitted and the combo will be re-tuned and dyno'd again.
The results (and photos) will be posted to this thread for review...Robert
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