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Do you have a lazer temp testing tool? If not you can get one most anywhere. Set the pressure where the boat doesn’t bounce then check the temperature after driving 25 miles. If the temperature is similar to the tow vehicle tires I would not worry about it. A high ply sidewall should be able to...
Very efficient motor. I pulled 8 degrees of timing to try to keep it at 9.50 for index class.
I now have 17° total timing and it still ran 9.45...
Pretty happy with this setup...
I was at a heavy duty truck alignment shop and grabbed a couple of used alignment shims that were in the scrap bin.
The 71 Demon I had as a kid had a similar vibration that you describe you’re experiencing. Getting the angle right took care of of it.
I have two build sheets. First is a 1969 318 engine. Last 6 of vin 296917.
Next a 1973 318 engine. Last six of vin 260?57 Sorry this sheet is a little rough. Looks like A5 color code which is Dark Silver I believe.