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"A swap to a B18 rear axle assembly on a B16-powered PV would result in a LOWER top speed? I'm certainly not looking for that...."
According to period road tests, the 4.55 ratio 85 hp B16 544 was a mph or two faster than the 4.10 ratio 90 hp B18 in the same car. FWIW, according to the same road tests, under acceleration the two cars were dead nuts even all the way to 80 mph.
I have personal experience to back up that last fact. Back in the day (1966-ish), I had a '62 B18, my brother had a '61 B16. It took dozens of 1/4 mile drag races :) to finally come to the conclusion they were perfectly matched cars, so far as acceleration was concerned. I don't think we ever ran them against each other on the open road (top end), so I can't confirm the first road test fact.
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Gary L - 142E ITB race car, 73 1800ES YouTube Racing Videos
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