I have been asked for a 8.5 inch pressure plate and I am not sure how to tell these apart from the 8.0 inch pressure plates. Both of the pressure plates I measured were 8.5 inch in diameter on the clutch surface. I would think that there should be some extra space around the clutch and believe that these are for a 8.0 inch clutch. Is the diameter of a 8.5 inch pressure plate 9.0 inch in diameter? Can anyone explain the differences or do both 8.0 and 8.5 inch use the same pressure plate?
Also, I have always looked at the casting date to determine if a head was a 1600 or a 1725. Last night I put a 1963 head next to a 1966 head and I could not see any external differences. Is there any way to tell besides measuring the size of the valves? Also do later (1967??) 1725 heads have different spark plug holes?
Confused in Chicago,
Tom
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