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Old 01-30-2005, 07:09 PM   #1
malticefalcon
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Internal or External Balancing - sbc 350 (3970014

Ok, I decided a while ago that I was going to build an engine. I have dropped them in and worked on them but have never built one from scratch. So I bought a sbc 350 that I want to drop in my 69 camaro. Thought I would by a few parts and that would be it. Wrong...... I have had to research cams, timing covers, fuel pumps, oil pumps, bolts and on and on. I am JEGS #1 customer right now. So I have my list of parts almost complet and I am assembling the engine and I get to installing the timing cover. But I can't buy a timing pointer because I need a harmonic balancer. S oI call JEGS and ask what they recommend and the first question is, "is the engine internally or externally balanced." No clue. So the guy tells me to check the GM number on the block behind the driver head and it reads 3970014 and he tells me to call GM.

I figure I can get a quick answer from here. What do you guys think. My engine block is a 3970014 and is a 2 bolt main. Looks like it came off a 70-76 camaro. I need to buy a balancer but need to know if it is internaaly or externally balanced.

Waht do you think?
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Old 01-30-2005, 07:16 PM   #2
cableguy0
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the only externally balanced small block was the 400. all 350's are internally balanced
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Old 01-30-2005, 07:17 PM   #3
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350s are internally balanced, the only SBC that is external balance is a 400 (and 383 since you're using the 400 crank)
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Old 01-30-2005, 07:29 PM   #4
LONGHAIR
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A Jegs counter man should know better than that...
and why would he tell you to check the numbers on the block when you need to know about the crank?......you could be putting a 400 crank into that block and need the externally balanced damper.

Last edited by LONGHAIR; 01-30-2005 at 07:32 PM.
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Old 01-30-2005, 07:59 PM   #5
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You got an order taker, not a parts person. Sad...
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Old 01-30-2005, 08:16 PM   #6
malticefalcon
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Awesome

Hey, everyone - thanks for the info - I stumbled across this board on Google when I typed in 3970014 sbc and got here. Looks like I got to the right place. After I posted, it looks like this is a truck board. Is it solely for trucks or am I allowed with my little hotrod.
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Old 01-30-2005, 08:20 PM   #7
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It's primarily for trucks, but some of us have other automotive interests too, might as well stick around and get some info from these very knowledgeble folks
Who knows you might one day want/need a tow vehicle for that F body (and what better than a matching year truck )
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05 Jeep Grand Cherokee-HEMI powered
87 Iroc Z28 305 TPI auto (crying out for an LS1 swap)
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Old 01-30-2005, 11:14 PM   #8
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Quote:
Originally Posted by rustyold72
It's primarily for trucks, but some of us have other automotive interests too, might as well stick around and get some info from these very knowledgeble folks
Who knows you might one day want/need a tow vehicle for that F body (and what better than a matching year truck )
Well said!
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Building a small, high rpm engine
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like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol....
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Old 01-31-2005, 12:08 AM   #9
ocbaud
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thats the same casting number as i have
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Old 01-31-2005, 09:11 PM   #10
jimfulco
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What's the number on the crank?
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