http://www.mopar1.us/sort.html
1992
This is a transition year with a rather unusual 360 block. It looked like a Magnum on the outside with the three flat, drilled pads along with the old style ears, but it was still the early engine on the inside with the oil holes in the cam and block. It’s a 53020006 casting
1993-’97
The 360 Magnum came out in ’93. It used the 53020006 block that came with the three flat, drilled pads and the oil style ears. It still had the oil holes in both deck surfaces, but they were not used because the rockers were oiled through the pushrods.
The best guess is that they were drilled so that the block could be used as a "fits-all" replacement; the cam without the holes blocked the flow of oil topside on the Magnums. This engine had the grooved rear cap with the dowel pin as well as the recess for the o-ring. The Magnum cams all came with the short snout, but without the oil holes in the two intermediate cam journals.
The 360 Magnum pistons have a unique rectangular dish that gives a 9.1:1 compression ratio with the new chambers. The rings are a nominal 1/16", 1/16" and 3/16" wide. The crank itself was carried over from the past, but the amount of external weight used for balance is different, so both the stick flywheel and the torque convertor are different than the earlier versions.
The non-Magnum engines required 19.79 in.oz. and the Magnums need 14.65 in.oz. in order to be properly balanced. The rear seal was the same two-piece fluorocarbon design used in other Magnum engines.
Interesting....according to this ....you can use LA heads on a magnum block up to 96 ish.....as the oil holes to the deck are there....my friend has a 96 engine he want to get rid of....
