Dyno tests, Crawford Cylinder Head
These dyno tests were conducted using the same short block that we used on Charlie Yapps Cyclone Cylinder head tests. Information on this short block is available under the Cyclone develpoment section of this web page.
We used this touring type short block to enable us to see the power developed by the cylinder head alone.
Dyno test #3
After testing carburetor jetting, timing selection, we ran Dyno test #3.
This test was with the FS electronic distributor set @ 29 degrees total ignition timing.
Dual Stromberg carburetors, 45 main jets, 65 power valves.
Shop 4-1 header, 1 1/2" diameter x 40" primary tubes, 2 1/2" collector
NGK B6ES spark plugs, .032" gap
Intake lash .015" hot
Air fuel ratio 12.7-1
Dyno test #4
This test was with the FS electronic distributor set @ 29 degrees total ignition timing.
Dual Stromberg carburetors, 45 main jets, 65 power valves.
Red's 4-1 header, 1 1/2" diameter x 26" primary tubes, 2 1/2" collector
NGK B6ES spark plugs, .032" gap
Intake lash .012" hot
Air fuel ratio 12.7-1
This test resulted in 124 corrected Horsepower @ 3200 RPM & over 200 Ft. Lbs. of torque @ 2000-2500 RPM!