308 heads

Alphabet Soup said
Ok... looks like I'm ordering some pushrods. Heads are already on the motor, so grinding is out of the question.
Thanks for the replies!

lol yup, probably a bad idea to grind on them now.

You should be ok with 5/16 but especially on big blocks 3/8 is the minimum if I can get them to fit.

I know without grinding you can get a 7/16 pushrod in a TF head. That’s the way it should be.