3904377 push rod

[Terry F.]

Any idea what diameter push rod this is, 3/8 inch??

Terry

[Joe L.]

Re: 3904377 push rod

Terry-----

GM #3904377 is a "one piece design", 5/16" OD, big block exhaust pushrod.

[Terry F.]

Re: 3904377 push rod

Joe, do they have an up or down to them? Or, either way? Terry

[Joe L.]

Re: 3904377 push rod

Terry-----

They can be installed in either orientation. All big block pushrods have stems that are case hardened for the entire length.

[Terry F.]

Re: 3904377 push rod

Well, I just purchased a set of nos off of ebay. I probably paid too much for them. I have this feeling that good aftermarket push rods are not too expensive. They look just like the ones in my 68 427 and based on what you have said, they should be perfect for my engine. I paid $50.00 for a set of 8.