318 pulley mistake, need the correct size.

Newbomb Turk said

I’m not near my FSM but IIRC by 1973 at the latest Chrysler was over driving the water pump by 19-20%.

That’s what I shoot for.

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You might be close, I just did the math with the 7 1/8 crank and the 5 7/8 WP pulley that I had just ordered and I get a ratio of 0.82:1.