What heads will work on an M670 Super gasoline?

Alan K

Well-known Member
Was wondering what heads will work on an M670 Super gasoline? Not building a puller, just want to be able to use it in the fall / winter. I believe it is a 1966 model, but Im guessing they might all be the same.
 
10A4230, think all m670s yearsare same like you but don't know, I know there's more than that but don't know what others and I don't know which is the best.
 
Mine has 4230s and it took me a little searching to find a good replacement set last summer. 4231s will work but you will probably have to use higher octane gas because of higher compression.

Brad
 
Find the head casting number between the spark plugs. You will need to stay with a similar thickness head in order to avoid changing push rods and head studs. Most of the heads used on that model; that I have seen: used similar thickness heads even though the compression chamber depth is different. Using different heads should only be "minor adjustments" as long as you stay close in thickness.
 

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