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Old 01-05-2013, 10:53 AM
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Originally Posted by GMC boogie View Post
It is a custom grind. I am not going to say the company.

Someone told me the fixture I am using for degreeing off the lobe is not accurate as it has a different radius.

Going to redegree using an actual lifter.
If you were using a roller radius indicator on the flat tappet lobe (or vise versa), you'd see an error, but it would be larger than what you're seeing, and it wouldn't add duration to just the closing side. Even a slightly different radius from the lifter your cam uses would not indicate what you're seeing, so it's not the tooling, per se.

This sounds like a mistake by the manufacturer, or they have pulled a cam off the shelf that's close to what you wanted- but even w/that, it's more cam than you bargained for.

I'd be on the horn to these guys...

BTW, if you use a hydraulic lifter to recheck it you should make it solid to remove the lifter piston travel from skewing the measurements. Stack it full of small washers or fill w/grease.
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