Reply to "Please help a beginner ☺ with Valve Spring Questions"

George PAdmin.

You make no mention of your application (street or racing) or any of the engine parameters. For instance what's the stroke? This makes it difficult to comment on the camshaft.

Although its rated at 294 degrees duration, that's measured at 0.015", the standard for rating the duration of a solid tappet camshaft however is 0.020". Therefore the cam looks a bit bigger than it really is when compared to other cams. However based on the lash specification the cam will begin lifting the valves at 0.013", so the advertised valve events aren't too far off.

Based on the advertised valve events the cam's overlap is 74 degrees. I do not recommend anything greater than 60 degrees overlap for a street engine. Peak horsepower shall occur at about 4000 FPM mean piston speed, which with a 3.500 crank is equivalent to 6850 RPM.

The net valve lift is 0.585" which is compatible with the Crane spring.

Net Lift = (0.351 lobe lift x 1.73 rocker ratio) - 0.022" lash

8/16/161:08 AM

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