273 Commando Piston Reuse - L2222N /.040

The only correction I would like to make to TMM's post is that the 273 should have a stock bore of 3.625, not rounded off to 3.63. But that shouldn't matter, the machinist shouldn't bore any motor before first putting a mic to the slugs.

You're correct Russ. I had to go down 2 flights of stairs at midnight to look it up in the service manual. lol 2 of my books and my desktop dyno listed it as 3.63. Exact bore size is a relative measurement because it is controlled by the piston diameter and the piston to cylinder wall clearance. Like your last sentence states, mike the slugs, add the clearance and bore to that dimension leaving a bit for honing.

Another note to 65Dart, make sure the machine shop uses a torque plate to bore and hone the block especially if it is going .030 or over. The main caps should be torqued also. (good machine shops wouldn't do it any other way) Nite all! tmm

tmm