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Old 09-02-2003, 08:58 AM
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engine identification

Hey folks,
I am trying to figure out what engine I have. There is a number stamped on the block where it joins the transmission (driver side). The number is 3970010. I was told it was out of a Corvette.

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Old 09-02-2003, 09:04 AM
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Go to www.motec.com to check your casting number

Oops thats www.mortec.com sorry
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Old 09-02-2003, 10:07 AM
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thanks for the URL. This is what I came up with

engine
3970010....350...69-80...2 or 4 (it has 4 bolt mains)


3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber


The reason I'm asking all of this is i'm trying to decide what to do with the engine. It fouls the #1 plug with oil in about a hundred miles. I belive it also has postive crankase pressure ( blowing oil out of the breather ) Do you think I just need to have the heads redone or the whole engine? What is your thoughts on this motor/ heads?
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Old 09-02-2003, 10:28 AM
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another cool thing about the 010,. some of those blocks have a high nickel content that help prevent heat damage. Under the timing chain cover there will be a 10 or 20,.... 20 being the highest content.
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Old 09-02-2003, 11:44 AM
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Will this number also be located under the flex plate? I can see a number "010" by its self and I was told this could be a high nickel content block. It's a 3970010 4-bolt main block out of a '76 GMC 3/4 truck.
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1984 Pontiac Grand Prix
-350 4-bolt main
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-Turbo 350 Transmission
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Old 09-02-2003, 12:32 PM
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Im not positive,. but I think some of them where cast under the bell housing mount boss under the flex plate and sometimes on the side or sides under the center freeze plug(s)
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Old 09-02-2003, 01:33 PM
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how much more do the high nickle content blocks usually sell for over the normal blocks? or is there a difference at all?
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1984 Pontiac Grand Prix
-350 4-bolt main
-Torker II Intake
-Holley 600 cfm 4-barrel
-Flowmaster Afterburner headers
-Turbo 350 Transmission
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Old 09-02-2003, 03:11 PM
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the only difference is that they dont warp or crack as easily as the typical block. They dont really sell for more. These are pretty common actually. There is no diffrence in cylinder wall thikness or anything like a bow tie does.
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Old 09-02-2003, 03:19 PM
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Oh, thanks.

Personally, I just thought a bow-tie block was a chevy block. lol, shows how much more I still have to learn at only 18 years of age
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1984 Pontiac Grand Prix
-350 4-bolt main
-Torker II Intake
-Holley 600 cfm 4-barrel
-Flowmaster Afterburner headers
-Turbo 350 Transmission
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