have a 63 Lemans (326) with a leaking water pump, told it should be 8 bolts, only 4 bolt. Did they use both on 63 326's or do I have a 389?  Thanks, Ron

Engine I D code is stamped pass side it is a 3 digit alpha numeric code stamped under production code . pass side front Just below cylinder head. If original engine I will be able to tell exactly what it is.....

Edited March 18, 20179 yr by TWO LANE BLACK TOP

Engine I D code is stamped pass side it is a 3 digit alpha numeric code stamped under production code . pass side front Just below cylinder head. If original engine will be able to tell exactly what it is....another quick way to tell if I D # is behind accessories and can't read easy. On the block pass side by the distibutor hole is a pyramid shaped lifting lug the 389 does not have it. The 326 does....

Edited March 19, 20179 yr by TWO LANE BLACK TOP

Here are the block codes and casting numbers for all '63 A-bodies.

2 Lane Blacktop, these are the #'s on front of block- on top is 600 just below is 276465 lower down is 263P below this is 124311. On right block side is GM 548311 also has pyramid by distributor hole. This should be a 326, did they have both 4 bolt and 8 bolt water pumps? All the local auto parts show an 8 bolt pump, but the existing pump is 4 bolt. Thanks,Ron

Out away from my literature right now As far as 8 bolt VS 4 bolt water pump would take old pump to parts store and match it up. Know 6 cyl pump is 4 bolt not sure which one 4 bolt or 8 bolt or both used on 326 depending on year or maybe A.C. non A.C...Or heavy duty cooling system or not ?

Edited March 20, 20179 yr by TWO LANE BLACK TOP

#600 = 326 CID with 2 bbl carb rated 260 horsepower with powerglide trans. RPO L-30. 548311 is casting #   276465 is production # of engine....should match VIN if original...Frostys chart above matches the same info I have. Sure it is accurate...

Edited March 20, 20179 yr by TWO LANE BLACK TOP

THANKS  Guys, headed to a shop to have old pump rebuilt. Car was a basket case, been apart over 12 years, should have sent to scrap yard. Had one new in 1963, let heart buy instead of head, wife and I dated in it, trying to go back, wife said can't happen. Thanks again for info.  Ron