Plastigage
 

Is the use of plastigage mandatory when assembling a motor. If the crankshaft moves about freely, should you still use plastigage anyways?
Just wondering.

It isn't mandatory, but it is a safe-guard to prevent firing up a motor that has been poorly machined or cast. I would say do anything you can to make sure it is perfect. An engine builder that I know doesn't use it, but he blueprints every engine.

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88GT stock shortblock, ported GT-40 iron heads, ported Edlebrock Performer intake, 24# inj, Pro-M 75mm Bullet MAM, 3.73, hurst short throw, F-303, electric fan, alum rad, FMS HD clutch, R134a ac conversion, 70mm TB , and some other stuff I probably forgot, best run so far on ET streets is 13.02@106 with a 1.87 60ft.

In your case it would be a safe guard against a "too loose" fit which could result in oiling problems (low pressure).

Like above it is not necessary on a blueprint unless you suspect something is not right (misslabelled bearing etc).

Mike

For the couple dollars it cost it is very helpful.