Re: 21 stud deck height, gasket thickness, etc. questions.
The stroke on #1 throw is 3.743. That's measured with 2 different starrett depth mics and checked with a B&S dial caliper. I could drag out other measuring methods but I'm confident in these tools, they get calibrated and get used daily. I have a 6" travel Starrett dial indicator but I don't think that's as accurate as depth mics and it would take a while to set up.
So the stroke is .007 short. That accounts for only .0035 of deck height.
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