Block identification

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Mar 17, 2020 | 10:07 PM

dpoliti9

Thread Starter

Cruising

Joined: Mar 2020

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From: Chesterland, OH

Block identification

Hi,
Can anyone decipher these block numbers?
Thanks,

S970010
V0520TKY
C4F45130

V0721UPB
TGF733353
408854

Thanks, Dale

Last edited by dpoliti9; Mar 17, 2020 at 10:07 PM.

Mar 17, 2020 | 10:32 PM

62corvette

Le Mans Master

Joined: Nov 2004

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From: Waterford WI

First line should be 3970010. They made millions and millions of 350s with that casting number. Other numbers I can look up when I am near my resources. Others will surely chime in.

Mar 17, 2020 | 11:32 PM

jackson

Le Mans Master

Joined: Sep 2001

Posts: 7,739

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From: Unreconstructed, South Carolina

Quote:

Originally Posted by dpoliti9

Hi,
Can anyone decipher these block numbers?
Thanks,

S970010
V0520TKY
C4F45130

V0721UPB
TGF733353
408854

Thanks, Dale

best WAG ... date code cast driver side just behind head

TKY = Flint 20 MAY 79 or 80 sbc 350 in Truck

UPB = Flint 21 JULY 86 or 90 sbc 350 in Truck

Last edited by jackson; Mar 17, 2020 at 11:34 PM.

Mar 18, 2020 | 02:37 PM

dpoliti9

Thread Starter

Cruising

Joined: Mar 2020

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From: Chesterland, OH

Thanks for the replies.

So here's my dilemma.
I want to build a motor for my '81. Currently it has a 350 4-bolt main from a 74 truck but I don't know what cam it has and the dipstick is on the driver's side. So I've been looking for a block to be able to build something that I know what's in it. The one block, V0721UPB, has an Eagle crank, oil pan & pump but all apart. On this one I can see the cylinders and they look clean, no gouges or cracks that I can see. The other, S970010, has crank, oil pan & pump and pistons assembled. The pistons are TRW flat heads and the cylinders have been bored .060.
Any suggestions on which to choose?

Mar 18, 2020 | 02:55 PM

jackson

Le Mans Master

Joined: Sep 2001

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From: Unreconstructed, South Carolina

You'll likely get some good & some silly suggestions but little to no consensus.
If your intent is to slap-patch something together; I can't advise.

Assuming you already own both blocks and both paid for:

If the UPB block has OE machining & OE bosses for OE Roller Cam and bore's is either good now or will clean up at no more than +0.030" ... and if it has a complete finished fuel pump mount pad ... then, hands down I'd choose the Roller Cam Block to build..That capability to easily & cheaply run a roller cam is important to me. I don't give a flip which side dipstick.

FWIW any sbc already +60 cannot be bored again. ... some very late sbc cannot successfully go that large

Mar 18, 2020 | 03:53 PM

jackson

Le Mans Master

Joined: Sep 2001

Posts: 7,739

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From: Unreconstructed, South Carolina

also, since you don't KNOW condition of blocks, cranks etc .. But Before you make any decision ... .suggest you take them to an auto machine shop and have them checked & measured ...
that way you'll KNOW what you have ... Know what have to work with and Know what's serviceable for someone else who might purchase.

Mar 18, 2020 | 09:01 PM

dpoliti9

Thread Starter

Cruising

Joined: Mar 2020

Posts: 10

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From: Chesterland, OH

Maybe I'll just buy a crate motor.
Thanks for all the replies.

Mar 19, 2020 | 09:35 AM

derekderek

Race Director

Joined: Jul 2015

Posts: 13,082

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From: SW Florida.

The .060 block You wanna do a quicky re-ring cuz they are good pistons and bores? Fine. But that block is already .020 past the recommended max bore size. So don't get attached to it. Another option is redo your existing 4-bolt 74 truck block. It MAY have a forged steel crank in it.