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Old 06-16-2010, 01:46 PM
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GM Engine Code Test

I located these engine codes, can someone please identify the motor, year, car, etc. and send reference links for identification.

Located on passenger side, below cylinder head: F0422HF

Located on back end of top of block: 3868174

Thanks in advance

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Old 06-16-2010, 02:05 PM
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HF 65 327 Corvette 300 L-75 Manual 4-Brl AFB Carter
HF 66 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 67 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 68 327 Impala 275 L-30 T-H 400 4-Brl Hyd Cam
HF 69 350 Nova 250 L-65 Power glide 2-Brl Hyd Cam
HF 69 350 Chevelle 250 L-65 Power glide 2-Brl Hyd Cam
HF 69 350 Camaro 250 L-65 Power glide 2-Brl Hyd Cam
HF 78 350 Pontiac 170 LM-1 TH 350 4-Brl Hyd Cam, Firebird

I think you misread the casting number, I believe it`s:
3858174....327...64-67...2
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Old 06-16-2010, 05:07 PM
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Re-check

Quote:
Originally Posted by DoubleVision
HF 65 327 Corvette 300 L-75 Manual 4-Brl AFB Carter
HF 66 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 67 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 68 327 Impala 275 L-30 T-H 400 4-Brl Hyd Cam
HF 69 350 Nova 250 L-65 Power glide 2-Brl Hyd Cam
HF 69 350 Chevelle 250 L-65 Power glide 2-Brl Hyd Cam
HF 69 350 Camaro 250 L-65 Power glide 2-Brl Hyd Cam
HF 78 350 Pontiac 170 LM-1 TH 350 4-Brl Hyd Cam, Firebird

I think you misread the casting number, I believe it`s:
3858174....327...64-67...2
You are 100% correct on the misread part! I double checked the casting number and it is 3858174. I purchased the car about 7 years ago with this engine in it, the car is a 1964 Impala SS automatic. I was advised the engine was a 327 (not the original block), but I never checked out the numbers. My body is not setup for air though!? Thank you for helping me out, what website did you use???
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Old 06-16-2010, 05:15 PM
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Follow-up

What do the other numbers represent?

Located on passenger side, below cylinder head: F0422HF


Thanks...
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Old 06-16-2010, 06:09 PM
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Probably mortec, but that site has been down for a while.
www.mortec.com

F= Flint (manufacturing plant)
04 = April
22 = day of the month
HF = the cars listed above ^^^.

Pull a valve cover. I'll bet you have "462's" on there.

Also, on the opposite side of the engine block (in the same area as the 3858174, but on the passenger side) there's a date code. It might be "D 22 7" or something like that.
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Old 06-16-2010, 06:37 PM
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Quote:
Originally Posted by 64Joker
My body is not setup for air though!?
Not "air" as in A/C.

The "A.I.R." referred to above is "air injection reactor", it was an early pollution control system that injected air into the exhaust manifold through a system of check valves and tubing, from a small air pump that was driven by the fan belt.

This was often one of the first things enthusiasts removed from their engines, the thinking being that this would increase performance- something that it actually didn't really do, the pump was not a big power robber and the air that was injected was post combustion chamber, so wasn't harmful to the engine's performance in that regard. But removing it was something that most any hack could do, so it was done. Often. And nowadays, finding an original system- intact- is all but impossible.
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Old 06-17-2010, 10:17 AM
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2nd Follow-up

So basically, the block could be from any one of these vehicles or is there
a way to narrow it down?

HF 65 327 Corvette 300 L-75 Manual 4-Brl AFB Carter
HF 66 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 67 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 68 327 Impala 275 L-30 T-H 400 4-Brl Hyd Cam

Are there any other numbers perhaps on the exhaust manifold to give us more info? I appreciate all the help and additional information (A.I.R.).
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Old 06-17-2010, 10:42 AM
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The date code on the block would help narrow it down. The date code on the heads would help too, and also would tell if theyre the matching/original heads. If it still has the original exhaust manifolds, and it has the A.I.R. "tubes" on it, that would help too. Also check if there was a pilot bushing/bearing in it, as well as a clutch ball. If there ever were a pilot bushing/bearing in there, that would narrow it down too (assuming it's original).

Last edited by a1supersport; 06-17-2010 at 10:51 AM.
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Old 06-17-2010, 10:48 AM
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Quote:
Originally Posted by 64Joker
So basically, the block could be from any one of these vehicles or is there
a way to narrow it down?

HF 65 327 Corvette 300 L-75 Manual 4-Brl AFB Carter
HF 66 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 67 327 Impala 275 L-30 Power glide 4-Brl Hyd Cam, A.I.R.
HF 68 327 Impala 275 L-30 T-H 400 4-Brl Hyd Cam

Are there any other numbers perhaps on the exhaust manifold to give us more info? I appreciate all the help and additional information (A.I.R.).
On the back of the engine, by where the distributor enters, there will be a date code. Something like D176, for instance. The letter is the month, the first number (if there's only two numbers, like D76) is the day, three numbers means the first two are the day, the last number is the year.

So D176 could be April 17, 1956, '66, '76, etc.
D76 could be April 7, '56, etc.

You can look on any cast part for numbers and date codes, there are info on most any SBC part that has a number.
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