Re: I think I am done
I have read about the expansion differential between bronze and cast iron but my machine shop has always been able to install phosphor bronze guides in my iron heads and they have worked very well. I don't know what all the tricks are whether it is liners or thick walled, which alloy they use, pre-heating the heads, knurling, how the guides or honed. They have always worked really well but I have also run crome stem stainless pro flo valves in my race heads. Maybe that also has something to do with it. They are chevy 350 valves, LOL. The hot rod engine does not see much run time. I have as yet to actually wear out the valve guides on a re-build.
The E7 heads I got for the 302 in my truck are the stock iron guides with stock valves.
The Vdub heads have bronze guides and Manley racemaster valves.
1965 289 mustang fastback
Last edited by Hottarod; 12-02-2012 at 01:34 PM.