Hey all,

I know I havent been on for awhile, life and stuff, but I am here to ask a question or two.

Anyway, I am re-sealing an 89 318 for my 72 Fury driver. The motor is out of an 89 Diplomat AHB. I got the pan off and on the rail near each cylinder are markings. Most of them on the drivers side are a "B" with an "X" in a circle, but one is a "C". Same on the other side except on one there is a "C" instead of the "B".

Anyone know what they mean? This motor is already an anomoly, it has a 9/87 casting date but the front is stamped 9M318 which is an 89 motor. Everything else is stamped mid 88.

- Jamie

Piston sizes. Chrysler had select fit pistons in .00025" increments. Look in the service manual for the piston sizes.

My 87 Diplomat's 318 has the same kind of markings. As I understand it, there are indications of bore sizing as related to piston fitment during factory assembly. Apparently, there is more to it than just hitting 3.91", A is tightest, B next tightest, C least tight. Not sure what the exact specs that correspond to the A, B, C markings other than they all are still considered standard bore. Mine had a lot of A's.

Post a pic.

Most "anomalies" can be easily explained in one of maybe 10 ways, few impact what we do unless its related to a size, over or under which most would measure all these things anyways.

I just ran out and looked at a roller block, easy to surmise since they are all under a cylinder its related to that, weather in size, finish, ect...just things related to production or assembly.

You casting date vs assembly date isnt uncommon either.

The one I just looked at had mostly D-s

If the pic works, here is the drivers side in the middle

Yep.

Your 11 hours from me, ive a bored, honed, roller block and new oem pistons id let go dirt cheap. For that matter ive nos mopar roller lifters, pushrods, dogbones and spyder all for the hydro la based cross over motors.

I forgot, ive even a nos set of hardened valve seat 318 roller cam heads.

If ya can use any of this junk, id dump it quick.

Hell, I think I got a whole 318.