AMC 401 block numbers.

aallison28

-------------------------------------------------------------------------------- DOwn by the crank, behind the pully, the numbers 3230132 are cast in the block. The waterpump has the number 3234411 cast into the waterpump. Anyone got any idea where I can find any information on these numbers? I've googled and cant find anything on those specific numbers.

aallison28

Anyone? Do these numbers even mean anything? Hello? Is this thing on.............?

tufcj

I believe those are just casting numbers for the front cover and water pump. The casting numbers and part numbers seldom matched on AMCs. The front covers are the same on all AMC V-8s from 66-91, although the oil filter adapter changed slightly. The water pumps are the same on all V-8s from 74-91. 66-73 are shorter, but the same basic housing. Bob tufcj

AMX69PHATTY

The Block Casting number is located on the drivers side in the back on top of a ledge created by the Bellhousing mating flange in the block. 401 Block casting number info on hand some may be part numbers rather than casting numbers believed correct but not guranteed 3195528 ..... 401 ..... 72-76 3198951 ..... 401 ..... 71-78 3220411 ..... 401 ..... 75-78 3414725 ..... 401 ..... 72-74 4488874 ..... 401 ..... 71-76

aallison28

Thanks for the info. I guess I'll have to climb no top of the motor as soon as the rain stops...........

AMX69PHATTY

Also, displacement is cast into both sides of the block in about 2 inch tall characters beneath the motor mount stand off brackets.

jeepsr4ever

AMX69PHATTY wrote
The Block Casting number is located on the drivers side in the back
on top of a ledge created by the Bellhousing mating flange in the block.

401 Block casting number info on hand
some may be part numbers rather than casting numbers
believed correct but not guranteed

3195528 ..... 401 ..... 72-76
3198951 ..... 401 ..... 71-78
3220411 ..... 401 ..... 75-78
3414725 ..... 401 ..... 72-74
4488874 ..... 401 ..... 71-76

There it is

aallison28

I know about displacement under the motor mount. I know it's a 401. But that's about all I know. It has the early distributor on it. I know it was swaped into an 86 grand waggie. I was told it was reciently rebuilt and the block looks like it's never been ran. I am trying to figure out what I've got so I know where to go from here. I need to put a potential motor build thread up asking for advice once I know what it is...............

jeepsr4ever

Well the heads will give it away. Block casting wil not tell you what year block and its trivial with a 401 because ay changes that were made were very small and wouldnt effect weight or performance. Peel a valve cover off and post the casting number.

aallison28

OK, pulled the valve covers and the number is 3220502-2 which means......... 401 74 57.92 2.025 1.680 Dog-Leg Bridged 322 0502 So I guess it's a run of the mill 1974 401. I'll start a seperate thread on what the build plan is.