Re: Big bore

Posted by Ross On 2013/5/13 6:37:26

Did that one afternoon with a Sawzall on a cracked block.

Cylinder walls are 1/4". That thin part of the intake port is a hair over 1/8". I always clean up the ports but make no effort to enlarge them!

If you look to left of the intake valve you can see why relieving is a good idea on any flathead that has the valves canted toward the cylinders.