Oversized valves and poorly made heads, also create an opportunity for the
valve seats to melt and sink into the heads. This happened on 3 sets of
heads before I found out that oversized valves, especially on heads made,
where the exhaust ports are made at casting time with plugs, were the
If I recall correctly, Great Plains says that they don't use oversize
valves because it can/will cause cracking in the head between valves...
and they don't use aluminum pushrods.
I have seen other engines use aluminum pushrods with steel caps with
excellent results, but those were not made
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