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Thanks again for the advice. I've found myself an engine builder who confirmed that every gram of weight difference is equivalent to about 10 pounds of force at 6000 revs, hence my engine probably would have destroyed itself with such a weight difference. So I've had all the rods and pistons...

That's great advice, thanks very much. I suspected it's too much, but now i know i can deal with it. Thanks again

I have had to put one new piston into my 2.1 pinto. However, now that i'm about to assemble, i've found that the new piston is slightly heavier than the existing 3 pistons (approx 1.5 oz). Does anyone have any idea what the maximum weight difference is considered to be acceptable in this...