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Thanks a lot Henry

Alright, also, I'm pretty sure on the 820 head, somebody wrote with a permanent marker 2.19/ 1.88. so Id assume they're cut that big. but i could be wrong, im trying to find more info on valve sizes...

3993820....71......oval...OPEN...402, 113cc chamber, 255/114 ports
6272292....70-78...oval...OPEN...402, 454
I found these results on mortec.com. im wondering whether 292 would be the same 113 cc....

If so, my local machine shop has those two heads and he wants $40 for them magnafluxed, and cleaned.
What do you guys think

Are 6272292's and 3993820's same combustion chamber? Same head basically?
any body have info on them would be great valve sizes etc..