[55GMCX2]

Originally Posted by Safari Larry

Good news, I used a long round file to knock out some of the rust buildup from inner 56 head and the 57 tube now inserts freely into the head! Assuming the 55 head is the same as 56, the 58 tubes will work.

That is good news. Thanks for taking the extra time to clean things up so the tube would fit. The pictures also help!!

I've contacted IndianPontiacs as Bill recommended to see if they have a set of 55-56 tubes, but I'm still waiting to hear back from them. I may go ahead and get the 58 tubes just to try them, but like you said, the challenge is going to be, which is left and which is right. I'd also like to see the two side by side for comparison.

The machine shop that's rebuilding my engine said that the tubes I have are shot and need to be replaced. They said that I could probably get away without them, but if I can find a set, then I'd be better off with them than without.

Thanks again,
Steve