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Message: <blockquote data-quote="Bullitt5339" data-source="post: 794024" data-attributes="member: 13030">I go with the adjustable lower, and then grind the keyways on the gear as well.  He will have to use Romeo style gears and bolts with aftermarket cams, there's no other way to do it. And here's the specs on my cams, nothing special, they're in a bunch of fast cars. I have pretty much no PTV clearance, .008, and was expecting to have to replace valves.:.560/.575 lift, 225/235 .050" duration, 108 LSALift isn't a problem in the PI engine, it's the duration and intalled intake centerline that'll get you in trouble.Duff, your cam's specs look like something I'd have run on ported NPI heads a few years ago. :thumbsup:</blockquote>