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Old 01-04-2009, 08:29 AM
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Hi . I was just wondering if someone could help me. 2 years ago, I bought an '83 olds delta 88 royale. And to my surprise, when I went to give it a tune-up, found out that the motor had been changed. I know it is a 307 for sure. I dont know what it came out of, though. It was made sometime after 1985 because it has 7A heads. I found a number on the side of the block directly below the cylinder head #1. It goes as follows...4NP414665. I've tried to Google it, but came up empty-handed, so I'm hoping that somebody can help..thanks

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Old 01-04-2009, 10:31 AM
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The casting number on Olds engines is located at the front of the block on top of the timing gear housing. A nine-digit engine ID code is stamped on a pad directly below the Number One cylinder. The first digit is a 3, signifying the Oldsmobile division, followed by a single digit for the year, e.g. 2=1972, a letter designating the assembly plant, and a six-digit serial number that will match the VIN if the engine is original to the car.
Heads are 72's
7A '72 350 64 409147 The 'A' is a subscript, like ľ"
tall, to lower right of the '7',
like | 7A.
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Old 01-04-2009, 05:09 PM
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Originally Posted by carpe_diem
...4NP414665. I've tried to Google it, but came up empty-handed, so I'm hoping that somebody can help..thanks
That's the VIN derivative. It decodes as follows:

4 = Buick division
N = 1992 model year. This letter is likely not an "N", because the last 307s were built in 1990. More likely this is an "H", which would signify the 1987 model year.
P = Pontiac, MI assembly plant
414665 = last six digits from the VIN of the car it was originally installed in

From this we conclude the engine came either from a 1987 Buick Estate wagon or a 1987 Regal. I don't know which of those two were built in Pontiac that year.

Did you not see the response to your question on the Oldsmobile board? While this is a roller cam motor, you need to find out which carb and ECU are installed on your car.

Originally Posted by Jim Rockford
Heads are 72's
No, they are not. The 85-90 307s used heads with 7A, where the "A" is the same size as the "7". These are NOT to be confused with the 1972 7A heads where the "A" is much smaller than the "7".
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