Thread: which harmonic balancer SBC 350

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I purchased a rebuilt sbc 350 and it didn't come with a harmonic balancer. How do I know which size to put on it?
The casting number is 3970014, This tells me 1970-1976. also, how do you tell inf your crank is internal or external balanced/ Sorry for being so dumb but this is the first chevy for a ford man.

Originally posted by krfrea
I purchased a rebuilt sbc 350 and it didn't come with a harmonic balancer. How do I know which size to put on it?
The casting number is 3970014, This tells me 1970-1976. also, how do you tell inf your crank is internal or external balanced/ Sorry for being so dumb but this is the first chevy for a ford man.

id measure from the timing tab on the front cover to the center of the front seal and find a bal. that would fit. if you know its a 350 shaft then its internal bal.

No tab there I will have to get that too.

Seems like we're eaten up with damper questions lately, this is the third time in just a few days I have referred to the Damper Doctor site. Krfrea, this chart indicates that at least 3 different dampers were used on a 350 '70-'76. Call these guys and see if they can steer you in the right direction...
http://www.damperdoctor.com/Merchant...egory_Code=CHE

for the st. i dont think it makes no dif. it don't bal the motor no way. if i had one already id use that, if i was buying one id get the 71/4". i would think bigger would be better.