identifying sbc harmonic balancer? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt_field · 10-15-2006, 11:25 PM

i bought a truck and the balancer is bad, slid back and hit the timing chain cover, so i get another off a supposudly 350, well its a lot taller and skinnier, mine is short and fat, how do you identify these? my engine is suppose to be a 350 THANKS!!!

matt

Aarons72s · 10-16-2006, 12:49 AM

Pics would help. What is the diamater of your old one? They came in 6" and 8" diamaters. Wide balancers are 350 and thin balancers are 305.
Aaron

arkracing · 10-16-2006, 07:02 AM

Quote:

Originally Posted by Aarons72s

Pics would help. What is the diamater of your old one? They came in 6" and 8" diamaters. Wide balancers are 350 and thin balancers are 305.
Aaron

Can you give me some dimensions - or pictures?
Actaully the 6" "Wide" balancer is for a 305 - and the timing mark may or may not be in the correct position.
the 6" "Skinny" balancer is for a 350
the 8" balancer is for a 350
the 8" with a big notch cut out of it is for a 400

Myself · 10-16-2006, 09:39 AM

The 305 and 350 dampers are interchangeable. After all it's the same crank.

arkracing · 10-17-2006, 09:35 PM

Quote:

Originally Posted by Myself

The 305 and 350 dampers are interchangeable. After all it's the same crank.

not technically - they are both internally balanced, so yes they are interchangable - BUT if you get one that has the timing tab on the tining cover @ the top behind the waterpump - you CANT put it on a timing cover with the "side timing tab"

and technically a 305 crank is 3.45" Stroke and a 350 Crank is 3.48" Stroke

Myself · 10-20-2006, 09:16 AM

Never heard of 3.45 stroke. Only 3.48, and I've personally pulled 2442 casting # cranks out of 305's and 350's. Same casting # means same crank. And if the balancer is clocked different just use the corresponding timing cover.

10-15-2006, 11:25 PM	#1
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	identifying sbc harmonic balancer? i bought a truck and the balancer is bad, slid back and hit the timing chain cover, so i get another off a supposudly 350, well its a lot taller and skinnier, mine is short and fat, how do you identify these? my engine is suppose to be a 350 THANKS!!! matt __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

10-16-2006, 12:49 AM	#2
Aarons72s Registered User Join Date: Apr 2006 Location: oklahoma Posts: 10,670	Re: identifying sbc harmonic balancer? Pics would help. What is the diamater of your old one? They came in 6" and 8" diamaters. Wide balancers are 350 and thin balancers are 305. Aaron

10-16-2006, 09:39 AM	#4
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,136	Re: identifying sbc harmonic balancer? The 305 and 350 dampers are interchangeable. After all it's the same crank.

10-20-2006, 09:16 AM	#6
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,136	Re: identifying sbc harmonic balancer? Never heard of 3.45 stroke. Only 3.48, and I've personally pulled 2442 casting # cranks out of 305's and 350's. Same casting # means same crank. And if the balancer is clocked different just use the corresponding timing cover. Last edited by Myself; 10-20-2006 at 09:17 AM.

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