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The crankshaft for the 124 & the 148 have the same size standard main (2.250"-2.2490")& rod (1.9375"-1.9365")journals. The length of the respective main & con rod journals is the same. The front & center main brgs & caps are the same. The rear main brg & cap are different. The crankshafts original p/n's and cross-ref p/n's up to 1989 do not match. That would indicate that they are not drop-in interchangeable. I have a 148 cid engine in a '59 311B & a '56 310. The casting nr on both those crankshafts is G11700. It has been too long since I overhauled my '53 VAC 124 cid, I can't even remember if it had a casting nr on it. If it did, it would have probably been VT or VTA + nr. The 124 & 148 cid engine blocks are substantially different in way of the rear main brg cap, rear main seal and its retainer: 1) The 124 rear main seal retainer is round, secured to the block with (3) 1/4" bolts on the top from the outside and (2) 1/4" bolts on the bottom from the inside and through the side of the rear main brg cap. 2) The 148 rear main seal retainer is quite larger, shaped like an upside down U with the bottom closed, secured to the block with (7) 1/4" bolts from the back + (2) threaded holes on the bottom for the oil pan. The standard sleeve bore for the 124 is 3-�� and for the 148 is 3-3/8". The 124 block may have casting nr VT328 just below the dipstick, the 148 block G1000 in the same area. The engine serial nr on both engines is stamped into the right side of the block above the starter. With that nr we can determine if the block is 124 or 148 cid, but the origin of the crank is still iffy. Joe
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