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  #1  
Old July 30th, 2018, 02:42 PM
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Default Decode 1967 230 Tornado Engine Code Number

Hi everyone! Newbie here. Looked at a 1967 M715 and can't see enough of the engine code number to determine what the number is. I have searched several different ways on the forum and am unable to find anything that will help me. Is there a way to decode the engine code number? Thanks in advance.
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Old July 30th, 2018, 03:11 PM
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I really have no memory of anyone even asking if there was an engine number. Much less how to figure out what it means.

You trying to determine if you have a matching numbers vehicle or narrow down the build date?
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Old July 30th, 2018, 03:21 PM
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Thanks for the reply Barrman. I am trying to record the engine code number. I believe the engine to be original, however because it has an engine number, I'm just trying to document it. The number as I can see it from my photos is: 30 M2 06 1275. The first few letter/numbers are hard to read.
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Old July 30th, 2018, 06:00 PM
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After doing research via my search engine, I may have more information: The engine code number may be 230-M2-06-1275. The "10" manual just shows a picture of the location of the number, not how it decodes.

230= 230 ci?
M2= unknown
06-12= date?
75= 7.5 compression ratio?

Does this look close?
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Old August 4th, 2018, 07:31 AM
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I have seen this info somewhere...have to try to remember...
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Old August 4th, 2018, 07:46 AM
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I do remember the 75 is the compression ratio...7.5 in our case and 8.5 optional on the civvy version...I think I found the decoder in an old civvy manual...hope I still have it...
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Old August 4th, 2018, 09:35 PM
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A week ago I was looking at a 1967 MOTOR Manual. I wasn't sure it would have enough useful military info in it to make it worth buying. Should I have brought it home?
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Old August 5th, 2018, 06:02 AM
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Well I searched everywhere for my book and couldnt find it...then I figured I must have posted it somewhere...looking back through the archived versions of the former board setups we used, I finally found this...talk about a blast from the past:
Quote:
From: brute4c
Date: Sun May 16, 1999 1:04am
Subject: Serial # decoding
Well, the engine numbers break down like this:
230-----Cubic inch
M-------Military
3-------Year, 1 is
1966, 2 is 67, 3 is 68, 4 is 69
04------Month, in your case April
02------Day, in your case the second day of April
75------Compression ratio, 7.5:1

There could be one or more letters between the Day and Compression ratio as shown below:
S-------Service engine, don't know what that means exactly...
R-------Short block
B-------Oversize bores
A-------Undersize crank and rod bearings
If I remember right, with the oversize bores and the undersize crank and rod journals, a number was given as well to indicate the amount that these dimensions varied from stock specs...e.g. A10 would be a .010" undersize for the crank/rod bearings.

Nice to bring this up to date!!
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Old August 5th, 2018, 06:04 AM
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So yours is a June 12th of 67 build date unit...how does that mate up with the VIN/Delivery Date?
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Old August 11th, 2018, 07:50 AM
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Anyone...anyone...Buehler....
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