> "Big valves serve no purpose in this application" Actually they do, particularly the exhaust valve. The majority of the heat absorbed by the valve is transmitted to the head through contact with the seat. The larger that surface the better the heat transfer. What heat doesn't get transferred through the seat interface migrates up the stem, cokes the oil that lubricates the stem in the guides, causes sticking and an eventual burned valve. Anything that helps keep cylinder temps low is going to contribute to a more reliable and longer-lived engine. Whether with oversized valves or OE valves, taking great care to optimize the valve and valve seat interface is one of several factors that differentiates between a well-done valve job and a buggyshop valve job. Mark's documentation of this process with the Corvair is essential reading.
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