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Jul 21st, 2025 | | | | Joined: Dec 2011 Posts: 40 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2011 Posts: 40 | Hi all...Merry Christmas to all...my question concerns the pre-fix to the casting number on my 1946 Chevy ¾ ton pickup (GM 839770). I can't find out what the GM is for...I though the correct pre-fix was DA??? Not sure if this was a GM Truck motor that was used for a re-furb job? Any help would be appreciated.
John
Last edited by jkully; 12/28/2011 10:57 PM.
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | 389770 is a 216 casting number, GM General Motors.
The numbers you should be looking for to find the "DA" will be stamped next to the distributor.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2011 Posts: 40 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2011 Posts: 40 | Thanks Dave...I check their tonight after Turkey...
Merry Christmas and a Happy New Year. John | | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | For a stock 1946 engine I believe your prefixes will be: BG or BL for a first series, DAA, DDA, DDM, DEA, or DEM for a 2nd series. | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | | | | | | Joined: Dec 2010 Posts: 25 New Guy | | New Guy Joined: Dec 2010 Posts: 25 | So if my prefix is DDA on a 1946 Chevy 1/2 ton, is the block a 216 or a 235? I've looked at different casting number sites (such as Inliners and Hemmings)and they list the prefix as a 235. I haven't looked for the casting number yet. | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | I may be reading the chart incorrectly but DDA was the prefix on 1946 engines in 5100, 5400, and 5700 trucks. If that is correct, those trucks' standard engine was a 235. POWER PLANT GENERAL INFORMATION Serial Numbers - Engine - DDA | | | | | Joined: Dec 2010 Posts: 25 New Guy | | New Guy Joined: Dec 2010 Posts: 25 | I looked again and did some more scraping. It is still obscured but I think it might be DBA instead of the DDA that I initially thought. So definitely a 216. | | | | | Joined: Dec 2011 Posts: 40 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2011 Posts: 40 | Hi all did some more checking and found the number on the top of the block to the back side of the distributor of "DAM 6066"...I can't find that code in the book, but the 839770 seems to put it in the 1946 year...any help would be appreactied.
John
Last edited by jkully; 12/28/2011 10:56 PM.
| | | | | Joined: Nov 2011 Posts: 196 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 196 | The prefix on my '46 216 is DBA as well!! | | |
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