but I was freshening a 383 that had ported 346 heads that had been fitted with 2.14/1.81 valves, and several of the ex valves showed evidence of contact
Interesting, Jim checked clearance with Trick Flow 240 on a 4.250" bore using a 8519pt1 head gasket, intake interference @ .770" and the exhaust retainer hit the seal at@.850" and still didn't hit the wall.