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Old 07-19-2007, 07:53 PM
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need casting number help

I found an engine that is going to be auctioned off tommorow and the casting number is 3970010. Mortec.com and my chevy bock say that it could be a 302, 327, or a 350. Is there any way to tell the difference if the engine is complete cause I don't really want a 302 or 327.

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Old 07-19-2007, 08:01 PM
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I would rather have a 302 or 327! to me they are way more valuable than a run of the mill "treefity". especially a 302. those are fast spinnin high revver's. but cant help you with the casting #s, im a Mopar guy
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Old 07-19-2007, 09:49 PM
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Only way to know is to measure the stroke.
302,327 & 350 all have 4" bores.
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Old 07-19-2007, 09:50 PM
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No, actually you would want it to be a 302 for resale value-sell it! If it's a 327 you can easily build a 350 out of it by changing the crank and pistons.
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Old 07-20-2007, 08:26 PM
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Well, my dad and I have got a new toy in the garage tonight. Still not sure what cubic inch it is but we couldn't pass it up at the auction. The engine is complete pulleys, carb, the whole nine yards. Bought it for 20 bucks. YEEEEEEEEEHAWWWWWW
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Old 07-20-2007, 09:02 PM
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Measure the balancer diameter, if it's an 8 inch balancer odds are it's a 4 bolt 350, if it has a 6 inch balancer it could be a 2 bolt 350,327, or 302. Also pull the valve covers off and get the casting numbers off the heads-this will also shed some light as to what the engine is. The numbers on the front of the block just in front of the right head will tell you what car, year, etc...
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Old 07-20-2007, 09:15 PM
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The odds are in your favor that it's a 350. The 3970010 casting 350 was very common, especially in pickups. The VIN code stamped in the deck surface will tell you what you've got, if it hasn't been machined off.
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Old 07-20-2007, 09:51 PM
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According to my literature this casting number is not a 302 but if it was cast in 1968 its a 327 and 1969 thru 1979 is a 350. low end power is stated at 185hp and the high end 370hp. This casting came with a 2 or 4 bolt main and was put into cars, trucks as well as corvettes. So your odds are its a 350 and you got one heck of a deal. I got basically the same complete motor you have but i had to pay $250. Even at $250 i think its still a good deal for me as you can not find a complete sbc 350 in the yards ive been to. Everything is in pieces and or gutted.
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Old 07-21-2007, 06:49 AM
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Thanks for all the help guys, hopefully this will motivate our 1962 C10 project.
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