Decode Block Numbers

Help with decoding your Hemi engine.

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SSSN8KE
Posts: 2
Joined: Mon Sep 23, 2019 6:51 am

Decode Block Numbers

Post by SSSN8KE » Wed Sep 25, 2019 3:24 pm

Hello
I'm trying to find out about my Hemi. The numbers stamped on the block are:

2468330-M

Then to the right of these numbers are:

17A 1
2

Can someone decide these?

Thanks
Stu.

George
Posts: 653
Joined: Wed Aug 25, 2004 4:12 pm
Location: Fl

Re: Decode Block Numbers

Post by George » Fri Jul 10, 2020 3:05 pm

What type of Hemi?

Dan.U
Posts: 1
Joined: Tue Jul 21, 2020 12:35 pm

Re: Decode Block Numbers

Post by Dan.U » Fri Jul 24, 2020 2:20 pm

I have a 50's Hemi with the numbers " m354 - | 4 |3 "
this number is behind the water pump and center on the block between the heads.
I was told that it was a 1954 354 from a school bus. I know it came from a bus, but the 354 didn't come out until 1956.
the 4 bbl carb has been added,here is a picture of the original intake or the one that came with the engine, it has the water inlet (thermostat).
the Valve covers are 20 1/4 " - over all length.
I have search some web sites and this numbers does not come up.
any Hemi guys out there know what year or cubic inch. any info. will be appreciated.
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BlueDjinn
Posts: 55
Joined: Fri Aug 28, 2009 2:27 pm

Re: Decode Block Numbers

Post by BlueDjinn » Fri Jul 31, 2020 2:43 pm

2468330 is a Hemi block. Casting #2468330-M is a 4 bolt main hemi type MEGA block with wedge mounts and head bolt location. It can be a replacement block for 440. Check your bore size.

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