some people use clay for the port entry test, some use nothing,some use a machined radius made for a particular cyl head, the flow #'s can be all over the place. I started using a radius to get more consistent results.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
