View Full Version : HM motor id


dropit69
May 8th, 07, 09:55 PM
only # i can get to right now..VI212HM..is this a 69 motor? thanks

69crazy
May 8th, 07, 10:53 PM
HM is a suffix for a 69 passenger car with a 350 250 HP with an auto tranny You need the casting # to confirm it.Also could be a 65 or 68 327ci.

Vintage 68
May 8th, 07, 10:53 PM
Could be a 1969 model year engine, but the 'HM' suffix was used for several years.
Here is a link to suffix decode info - http://www.nastyz28.com/gm-chevy-codes/chevy-engine-codes-suffix-5.php

The suffix would decode as:
V = Flint engine assembly
12 = December (1968)
12 = Day of month
HM = State of Tune for assembly - see info for possible uses.

Hope this helps;
John

dropit69
May 9th, 07, 12:26 AM
ill get casting # tomm..thanks guys..

tar6569
May 9th, 07, 04:55 PM
ill get casting # tomm..thanks guys..

Could you also get the vin# on the engine pad?

dropit69
May 9th, 07, 06:20 PM
yeah sure..ddint have time today but will get tomm..need to do some motor work anyhow..

dropit69
May 10th, 07, 10:38 AM
here's what was on front pad....18F154918 VI212HM

Vintage 68
May 10th, 07, 10:55 AM
here's what was on front pad....18F154918 VI212HM

Here's a decode of that partial VIN number:
1 = Chevrolet Division of GM
8 = 1968 year model
F = Flint, Michigan final assembly plant
154918 = sequencial vehicle number for registration - last part of the actual VIN.

the V1212HM would then be:
V = Flint engine assembly
12 = December assembly month
12 = 12th day of month
HM = 327ci, 250 HP, 4 barrel carb, TurboHydramatic 350 automatic in a Full Size passenger car.

So there you have it, it's a 1968 327 block. It could be the 4" block has now been fitted with a different crank during a rebuild. You will have to dig into it a bit to know for sure what you now have.

Hope this helps;
John

dropit69
May 10th, 07, 12:51 PM
at least i know what i got now..thanks John for all your help

tar6569
May 11th, 07, 10:26 AM
Would it be possible to get the casting number on the back of the block. I am wondering if it is a 3914660 or 3914678 block.
Warren

dropit69
May 11th, 07, 07:49 PM
no problem ...ill get that mon as im working all weekend..does that make a diff in it?..its in a 69 convertible..was hoping it was #;s to car but thats out the window..lol