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HV oil pump is no good with your stock pan, you're going to run the pan dry unless you at least add a crank scraper.... if you're going to add a cam to that motor, you should probably match to your...

yes sireee dave, i experienced it when i put a 478 lift cam in my motor, ripped all the rocker studs out, what a PITA..... so i ended up going to a newer set of heads that were ported and polished...

yes thats a safe lift cam for a 289, as long as you match your valve springs a stock head should be able to flow that decently.... i would reccomend upgrading to roller rockers though, i've had...

well i'm sure you can get into the .600s in lift if you want, but over .500 is risking valve clearance issues with the pistons on a 289... what are the specs of everything else in your motor and...