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Old 02-17-2013, 03:25 PM
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Pat Kelly's calculator uses a more realistic valve closing point(.006) than United Machine's(.050 + 15) IMO.
Two heads and an RPM intake for $125 sounds to good to be true if they were any good. I'd look at the intake for signs that it had been milled or excess corrosion in coolant passages. May not fit or milled so much that it can't be used? Do the heads have any guarantee against cracks or worn guides?
If they are the swirl port type, I would think that their low rpm limit wouldn't be a good match for the RPM intakes 1500-6500rpm design parameters(as someone already pointed out). If the heads had "some" work done to remove the vane in the intake ports it might be a different story. JMO
I would agree that the compression would be too high for iron heads especially with the small duration cam. Again JMO


Last edited by ssmonty; 02-17-2013 at 03:33 PM.
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Old 02-17-2013, 03:59 PM
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Originally Posted by maxxman04 View Post
but according to comp cams and the spec card, that number is at .006 lift, not .050 lift.

That number (57 ABDC) is the correct number using the Pat Kelly calculator and most others.
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Old 02-17-2013, 04:36 PM
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Originally Posted by maxxman04 View Post
second set did have receipt. and mag residue. not sure what shop did it, rebuild done in december. i agree. i never buy used heads without having them magged. like you, i make a deal with seller as far as cost. but, i took a chance on the first set, without it being done first. got alot of valves/springs and stuff now. lol.
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