Another very mild 440 build.....

In this old thread a 361 is referenced that used 1.81 exhaust valves and all eight hit the bore w/ one of them breaking off the head of the valve. When the headers were pulled off the engine you could see the camshaft through the exhaust port.

How do I know? I was there.

Stock 361 bore 4.125". 413 bore 4.18". Yep........good idea to check.

PHR 361 "Forgotten Motor" Build - 618HP, 520 Torque - Good Read!