Pulled apart my JY motor.. few suprises...

[cams1021]

The cylinder walls have very fresh honing marks on them. From what I can read, the outside pistons have a "BL" printed on them, and the two inside ones say "CL".

If its a stock bore with just a hone on them... hopefully the car didnt make it to the junk yard for engine problems related to it

Does this raise any flags to anyone? Noone around here sells a bore gauge, so it will be a while before I can take any measurements

[bluneon]

what about a telescoping guage?

http://buy1.snapon.com/catalog/item....re&dir=catalog

[cams1021]

Would they pull the pistons and rods out the top and just replace the rings, hone the cylinders and put it back together?

Im tempted to just leave the cast pistons in there as I have a large I/C...

[mpgmike]

The "BL" and "CL" refer to the size of the bore when manufactured. Ma Mopar is cranking crazy numbers of engine blocks out of the assembly line every minute. Whereas your friendly neighborhood machinist will try to get bores to an exact size, roundness, and finish texture, the factory just wants to kick out boceaux blocks at a low cost. End result is variances in the cylinder bore sizes. To maintain quality while keeping costs low, Chrysler made up ever-so-slightly different sized pistons for the engines (not just the 2.2s but 3.7, 5.2, 5.7 Hemi, etc.). As the bare blocks roll out of the machining section, the bores are measured. A 3.445" hole would get an "A" piston. A 3.447" hole would get a "B" piston, and so forth.

The "B" and "C" on the pistons reference this size. If you look at the oil pan rail, there should be corresponding "B"s and "C"s stamped under the cylinders. If you decide to reuse the old pistons, just be sure to get the "B" pistons into the "B" holes and "C" pistons into the "C" holes. I have freshened up about 8 engines by just deglazing or honing the cylinders and installing fresh rings on the old pistons.

Mike