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Old 10-09-2010, 09:56 PM
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Engine ID Confusion!

I have recently acquired my wife's old 71 Chevelle and am trying to figure out what engine was put in it after she blew up the Malibu 400 that was originally in it. This car is the only reason we met and has sat in a garage for five years and I am trying to give it the respect it deserves! Trying to find out the block code and have ran into all kinds of problems. Any info would help in beginning the "re-birth" of this beautiful machine!

18S108687
T0907HF

Thanks ahead of time!

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Old 10-09-2010, 10:28 PM
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codeing

Look behind the drivers side valve cover on the back of the engine the trans bolts to and you will see a long # like 3970010 that is the block number. On the opposite side of block there is a date code with a letter and some numbers. The letter is for the month like c is for march then the rest is day then year. The long block number may cover a few years of use that is why you need the date code to narrow it down. Also pull a valve cover there are head numbers and date codes, each is on opposite side of the cyl head, the can also be decoded which I am sure me or some one will be glad to do if you post the block and head numbers and date codes. Hope this helps.
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Old 10-09-2010, 10:53 PM
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"HF" is either 1965 327 300hp, 1966 327 275hp, 1969 350 275hp, or 1978 350 170hp. You will need to post up the block casting number and date casting code off the bellhousing flange area of the block to narrow it down further.
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Old 10-09-2010, 11:34 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

As mentioned, you`ll need the casting numbers and the date to confirm what you have.
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Old 10-10-2010, 03:47 PM
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Thanks for all the input and advice. Without taking the valve covers off yet, this is what I found...

Block Number: 3914660
Casting Date: H247

And another number located directly behind the carb on the top of the block: 14014432 CFM

New to the world of old Chevy's but lovin every minute of it thus far!
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Old 10-10-2010, 04:31 PM
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Casting Date H247 is August("H")24th, 1967("7"), matches up with block casting code 3914660 is '68-69 327. An engine cast in August 1967 would be for the next years car line. Looks like you have a 327.
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Old 10-10-2010, 05:01 PM
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Poke a finger up inside the center of the damper to see if you have a "no damper bolt" 327. That's how my '68 327 was- it was a 660 block as well, from a '68 Impala w/HG suffix (PG trans).
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Old 10-10-2010, 06:07 PM
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If it`s a large journal 327 hang on to it, those are very difficult to find.
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Old 10-10-2010, 08:48 PM
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Thank you all. You have been most helpful. After an exciting day of digging into it, looks like the replacement was a 68' Impala 327ci. 275hp TH400. Still need to find out if its a large-journal or not (told it was) as well as if it is a "no damper bolt" 327. Not quite the Malibu 400 I wish was still in it, but certainly worth holding on to and cleaning up.
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Old 10-11-2010, 05:57 AM
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Quote:
Originally Posted by 71vellelover
Thank you all. You have been most helpful. After an exciting day of digging into it, looks like the replacement was a 68' Impala 327ci. 275hp TH400. Still need to find out if its a large-journal or not (told it was) as well as if it is a "no damper bolt" 327. Not quite the Malibu 400 I wish was still in it, but certainly worth holding on to and cleaning up.
99% chance it is a LJ cast crank engine. I don't know if that's a bummer for you, but that's what it is.

FWIW, that engine will make a fine powerplant for a high performance street/strip vehicle. I don't know what heads you have on yours, mine were casting number 040. Just like a small valve (1.94" intake x 1.5" exhaust) "fulie" head, but w/o the double hump ID on the ends of the heads. No accessory bolt holes.
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