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Actually I am looking at all options....Mechanical and mechanical roller are on top of my list,I don't mind the need for periodic adjustments....I welcome it!!

I have 2 pairs of 321-6086 heads if that will help.

Thank you all for the input,I have built a number of motors for other people in the past but this is the first amc build and the first that is for my own project.I am looking for a tough street...

I am building a 401 for a 69 jav project want know if my heads can be machined for larger valves and if so,what may work best. They are 77 heads # 3231475.I plan to do some port work, just want some...