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73 TR7RV Engine--

Still waiting on my repair manual... my pistons have an "M" stamped on them and the only numbers I can find are "367". Can anyone tell me what, if anything, those numbers/letters mean?

Thanks
 

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should be stock

almost all aftermarket piston have size stamped in it. exp .010 or std, .020 etc.

best way measure with mic and you have exact size of bore. if really rusty wait till machine shop does this and order piston after.
 
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