It isn't that easy as far as comparing lift only. There are alot of things that go into cam design that I don't understand but things like duration make a huge difference. Varying the LSA of a cam can greatly change the power characteristics of a motor. Not to mention if the cam has a few degrees of advance or retard ground into it it changes things also. International may not have increased the lift of a cam because eithor A they didn't want to change things up because they were worried about piston to valve clearance B the factory valve guides won't allow anymore lift C the head doesn't flow well at the increased lift. I've done alittle hotrodding and I'll tell you that with just my limited experience there is a bunch more to a cam than just the lift.
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