Quote Originally Posted by pat mccarthy
they are about the same head look at valve size .the chambers is the same some head had very small valves and rotators on intake and ex but not sure on the 820 to 292the 292 has rotators just on the ex side and takes a 2.065-1.72 valves
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 for the 820 but no luck yet. I measured the middle groove of the 3 angle that is present on both heads, approximately accross. and both came up at 2 and 3/16ths. im not sure what that translates into decimals but. They appear the same, but i best bet bring em in when i get work done to them at the machine shop and have them fit a few valves to check.
im gonna deck them .005 just to be a straight head, new guides, 3 angle job, clean job.