On the left is the gear-drive cam and its distributor drive gear, while the pair on the right are for conventional chain drive. Notice the different helix angle of the gears. Shown here are the cam ...
Editor's Note: Way back in March of 1998, GMHTP ran "Opti-Spark" by Ray Bohacz, an engineering-level dissection of GM's Opti-Spark distributor. This evolutionary ignition component was a bridge ...
When Chet Herbert introduced roller tappet camshafts to racing in 1950, he established an upper echelon of performance hardware that continues to carry that hard-core mystique. The roller tappet ...
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