Harold makes the best cams. He's a good friend of ours, and we use his cams almost exclusively. Those heads both have 30° seats so you definitely want some seat pressure.
That cam has a major intensity number of 33°. That's the difference between @ .020" and .050" duration. This cam will need 150-160 Lbs. on the seat, minimum, and 350-400 open. A little more would be a good thing if you can find a spring that will work with that installed height.
Do you know what the installed height is by chance? Are you running RAIV valves?
Now, the lobe profile is pretty fast but not so fast that you will need lifter bore bracing. You should be fine. When the Major Intensity Number[MIN for short] gets below 30°, you better start thinking about lifter bore reinforcement or an aftermarket block.
I can look up some springs for you if like. I just need to know installed height.
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Paul Carter
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Last edited by gtofreek; 11-17-2012 at 11:13 PM.
Reason: Sorry, I thought this was a solid roller but it is a solid flat tappet, with a really fast ramp.
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