head casting number 4772576?

Terry,
The 1213 gasket is a bit larger than the port in a stock head, so I use the clay method as it will conform to the actual port size and this way I don't have a mismatch, I also touched up the valve job as the valve face angle was over .125 wide and I wanted to be closer to what the factory actually had in the head when new for a honest representation of the casting. So this may be the difference in the port flow. I have found as much as 35 cfm's in a good valve job. But this wasn't useing the serdi cutters as they would have removed too much of the bowl and wouldn't have represented the factory casting, and then the #'s would have been off for sure.

Did you get the pics of the 18SPX's I sent you?