C20 307 engine whoes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PWPrice · 03-16-2017, 10:31 AM

Vet needs help. First off, I am restoring 69 C20 with a 307 Factory 2 barrel engine. Tore it down to replace timing chain and cover seal. Took off harmonic balancer which had NO BOLT. Need to know correct size balancer this engine came with because I Did not measure old one. I ordered a Pioneer Product 6.120 with degree marks from Summit. Second, after ordering this I find out it needs a different timing pointer since the TDC is not like OEM old one. Did I buy the wrong size? I have read the treads for installing a balancer with no bolt.

BugzC10 · 03-16-2017, 10:51 AM

I bought this one for my original 70' 307...fits perfect. ..with timing marks.
Dorman 594-156R Harmonic Balancer.

GASoline71 · 03-16-2017, 11:55 AM

Is the engine original to the truck? Lots of engines are swapped into these rigs after 40+ years.

Gary

PWPrice · 03-16-2017, 12:37 PM

Yes, this truck had verified 86000 miles on it. Front seal was leaking and cover was dented from cam. Believe someone before replace timing chain. Want to put correct size damper on it.

geezer#99 · 03-16-2017, 12:53 PM

You got pics of your motor?
You can buy a sleeve to slide over the balancer snout to stop the leak.

03-16-2017, 10:31 AM	#1
PWPrice Registered User Join Date: Feb 2013 Location: Bellevue Nebraska Posts: 2	C20 307 engine whoes Vet needs help. First off, I am restoring 69 C20 with a 307 Factory 2 barrel engine. Tore it down to replace timing chain and cover seal. Took off harmonic balancer which had NO BOLT. Need to know correct size balancer this engine came with because I Did not measure old one. I ordered a Pioneer Product 6.120 with degree marks from Summit. Second, after ordering this I find out it needs a different timing pointer since the TDC is not like OEM old one. Did I buy the wrong size? I have read the treads for installing a balancer with no bolt.

03-16-2017, 10:51 AM	#2
BugzC10 Registered User Join Date: Oct 2012 Location: Rose Hill Kansas Posts: 1,351	Re: C20 307 engine whoes I bought this one for my original 70' 307...fits perfect. ..with timing marks. Dorman 594-156R Harmonic Balancer. __________________ 1970 C10 Short Stepper with 71/72 front clip.

03-16-2017, 12:37 PM	#4
PWPrice Registered User Join Date: Feb 2013 Location: Bellevue Nebraska Posts: 2	Re: C20 307 engine whoes Yes, this truck had verified 86000 miles on it. Front seal was leaking and cover was dented from cam. Believe someone before replace timing chain. Want to put correct size damper on it.

03-16-2017, 12:53 PM	#5
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,731	Re: C20 307 engine whoes You got pics of your motor? You can buy a sleeve to slide over the balancer snout to stop the leak.

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