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Old Oct 22, 2005 | 04:08 PM
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vette70's Avatar
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Default Need help on engine size

Need some help fiquring out what engine I have. Numbers on drivers side rear of block are.
24GM
3970010

The reason I ask is I was changing fuel pump and picked up 1970 fuel pump at auto parts and it mounts with two bolts. Fuel pump I'm replacing because it leaks has four bolts.

Engine is not original and has been decked I think, because no number on passenger side on front of block are gone.

How can I determine what engine I have.
Anyone know at least when they changed to a four bolt fuel pump.

Any help would be appreciated.
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Old Oct 22, 2005 | 04:21 PM
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Default

Originally Posted by vette70
Need some help fiquring out what engine I have. Numbers on drivers side rear of block are.
24GM
3970010

The reason I ask is I was changing fuel pump and picked up 1970 fuel pump at auto parts and it mounts with two bolts. Fuel pump I'm replacing because it leaks has four bolts.

Engine is not original and has been decked I think, because no number on passenger side on front of block are gone.

How can I determine what engine I have.
Anyone know at least when they changed to a four bolt fuel pump.

Any help would be appreciated.
Are you sure there were "4" bolts actually holding the pump on? There should be 2 bolts holding the fuel pump plate, but only 2 other bolts actually holding the pump to the block...
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Old Oct 22, 2005 | 04:32 PM
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Default Forget I ask My Eyes Are Bad as I get Old

You are right I just glanced down there and it was just more of a somewhat bad day. Had just stripped a bolt on something else. Took the new fuel pump out of box and glanced down at old pump and engine
and thought I saw four bolts connecting.

Say a few bad words and thought well this is the way my day is going.

As they say """"NEVER MIND"""

Thanks for the quick answer, say me a embarassing trip to parts store.

Thanks
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Old Oct 22, 2005 | 04:53 PM
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From: NC USA
Default It's a 350

That casting was used from 69-80 with 2 or 4 bolt mains.

Not sure about the 24GM??? There should be a casting number either on the pass side or drivers side of the block behind the valve covers just in front of the bell housing.
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Old Oct 22, 2005 | 08:58 PM
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Default block casting #

3970010# is a late casting # for 1969 350
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Old Oct 22, 2005 | 09:07 PM
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Originally Posted by 694speed350
3970010# is a late casting # for 1969 350
that is correct but was not limited to the 69. There were many more applications for the #3970010 including 2 bolt and 4 bolt main cap configurations...
3970010 1969-69 350 255-350 4 Truck/Passenger/Chevelle/Chevy II/Corvette/Camaro
3970010 1970-80 350 145-350 2/4 Truck/Passenger/Chevelle/Chevy II/Corvette/Camaro
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Old Oct 22, 2005 | 09:08 PM
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Originally Posted by vette70
You are right I just glanced down there and it was just more of a somewhat bad day. Had just stripped a bolt on something else. Took the new fuel pump out of box and glanced down at old pump and engine
and thought I saw four bolts connecting.

Say a few bad words and thought well this is the way my day is going.

As they say """"NEVER MIND"""

Thanks for the quick answer, say me a embarassing trip to parts store.

Thanks
hey...happens to the best of us...I can think of many of those situations
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