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2014 Chevy Silverado
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motor decoding help.

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Old Oct 18, 2011 | 6:11 PM
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81scottsdale
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Default motor decoding help.
i have a 81 scottsdale. that i thought had a 305. but when i pulled the motor i seen on the block the numbers said 25 GM 3970010. i was wondering if someone could tell me what it is. thanks.
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Old Oct 18, 2011 | 6:41 PM
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http://www.strokerengine.com/SBCcasting.html

scroll down and you will see this decodes as a 2 or 4 bolt main 350 block, '69-'80.
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Old Oct 19, 2011 | 4:19 AM
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Ok. Why couldn't it be a 327? Has the same number.
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Old Oct 19, 2011 | 6:05 PM
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MOST, not all, production small blocks use the same block, just different cylinder bore sizes, crank journals basically. a measurement of cylinder bore diameter can tell alot.
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