As ckelly said, the rods/pins/pistons need balanced to the bobweight of the crank. It's good that they are all consistent already, but that's not the -main- point of the balance job.

The balance shop will make them all consistent down to around a gram (the weight of two extra strength Tylenol pills) then drill the crank counterweights in the right places to balance the crank/rods/pistons to the crank.

You will want to take EVERY part of the rotating assembly with you to the shop when you go... Harmonic dampner, crank, rods, pistons, pins, rings, flywheel/flexplate, clutch pressure plate.... and some will even take the crank pulley.

Good Luck!

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66 mustang
302 4-speed 289 heads, 10.63 @ 129.3
[url]http://www.mustangworks.com/cgi-bin/moi-display.cgi?220[/url]
[img]http://webpages.charter.net/hotrods/stang2.jpg[/img]
[img]http://webpages.charter.net/hotrods/stang3.jpg[/img]