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Old 11-16-2010, 12:46 PM
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Engine block number

Was hoping someone could give me some info. I have an 81 pontiac grand prix. Org had the V-6 and someone dropped a v-8 into it. I think it's the olds 307 but I am not sure. It has the oil tube on the front passengers side as well as the distributer behind the carb and doesn't go through the intake. I found numbers just behind the water pump 3161GM501. Could any please help with any info.

Thanks,
Rob

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Old 11-16-2010, 01:45 PM
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I also found 5A just about and to the right of the #1 cylinder.
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Old 11-16-2010, 03:09 PM
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Yes, it's a 1981-88 307. Unfortunately, that's all you can tell from the block casting number, since the same casting was used on all 307s.
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Old 11-16-2010, 03:11 PM
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It will help to know the number(s) on the cylinder heads next to the No.1 and No. 8 spark plugs. 5A would indicate the larger ports and flat tappet cam used on the 1981-85 307s. 7A indicates the peanut ports and roller cam used from 85-90.
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Old 11-16-2010, 05:10 PM
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block number

Yeah I checked the one above #8 is 5A as well. Is there much of a difference in parts between the h.o. engines? So with out any other info is there any other way to narrow down the yr of the engine?
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Old 11-16-2010, 06:35 PM
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Quote:
Originally Posted by acehogg69
Yeah I checked the one above #8 is 5A as well. Is there much of a difference in parts between the h.o. engines? So with out any other info is there any other way to narrow down the yr of the engine?
The exact year of the BLOCK can be determined from the VIN derivative stamp, located on the driver's side of the block below and slightly forward of the no. 1 exhaust port. The alternator and/or PS pump brackets are usually in the way. The main differences between the 140 HP and 180 HP motors are the cam, carb, and ignition curve in the ECU.
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Old 11-17-2010, 05:42 AM
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Thank you for the info. I will look later after work and try and find those numbers. Thanks again, Rob.
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Old 11-17-2010, 02:34 PM
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I checked in the area you mentioned with a mirror and flashlight I didn't see anything. Could it possibly be somewhere else? This w/e I will pull the brackets off. I seen pretty well with the mirror and nothing caught my eye. Also do u have an idea how many digits there should be?
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Old 11-17-2010, 03:45 PM
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Quote:
Originally Posted by acehogg69
I checked in the area you mentioned with a mirror and flashlight I didn't see anything. Could it possibly be somewhere else? This w/e I will pull the brackets off. I seen pretty well with the mirror and nothing caught my eye. Also do u have an idea how many digits there should be?
Here's where you'll find the VIN derivative:

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Old 11-17-2010, 04:26 PM
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I found them. They are rusted up and unreadable. Any ideas on how to pull em out? I was thinking either a piece of paper and pencil and see if they show or taking some black paint wiping it on the area and carefully wiping it off.
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Old 11-18-2010, 01:13 PM
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Does it really matter? The VIN derivative won't tell you if it's a 140 or 180 HP motor, and the 5A heads tell you it's an 81-85 flat tappet cam motor. Parts are virtually identical over those years. I don't know what else the exact year of manufacture will tell you. You would need to pull the cam and measure it to determine if it's a 140 or 180 HP motor.
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