Harmonic Balancer Bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 08-22-2002, 10:12 PM

I'm in the process of rebuilding my 68 327. My question is, is there supposed to be a harmonic balancer bolt in the crank, or is mine broke off in the crank. I tried looking at it and since it was painted over, I couldn't tell.

I was thinking there was one, but after talking to a guy at work, he suggested I look into it more because he thought there was a certain engine that didn't.

Longhorn Man · 08-22-2002, 10:18 PM

Quote:

Originally posted by Ackattack
because he thought there was a certain engine that didn't.

Only the ones with the ballancer flying off.
With the constant heat up, cool down cycles that a crank goes through, and the vibrations that the ballancer is supposed to reduce, and the RPM's that an engine spins (even with a normal driver) I would not trust one without a bolt one bit.

slam33 · 08-22-2002, 10:19 PM

Some were a press fit, 327 would be about the right vintage for that. You could try running a tap though it and see if the might be there threads are really there. Not sure of the bolt size but Moroso's web site will have it listed

Ackattack · 08-22-2002, 10:25 PM

That's what I was told: it might be a press fit

Ackattack · 08-22-2002, 10:27 PM

just checked in my chilton's manual and yep, it's pressed on. Answered my own Q. Thanks though

Longhorn Man · 08-22-2002, 10:28 PM

They are all pressed on, that's why you need a puller to remove, and an installer to install one.
I may well be wrong on all of them needing bolts, but i see no way for it to stay on, let alone stay in the same position.

slam33 · 08-22-2002, 10:33 PM

There keyed on and around the time of the 350 they began to do the bolts as extra securety.

mikep · 08-23-2002, 01:17 AM

Ive only seen a few 327's that had bolts to retain the balancer. The vast majority of 327's weren't even drilled for the bolt from the factory much less tapped . I even had one early 350 that wasn't drilled for the bolt. Ive never seen a 283 that was drilled for the bolt. It was a learning curve in the early years of the small block. Remember the 265's didnt even have an oil filter .

Hooter · 08-23-2002, 04:40 AM

huh, learn a couple of new things everyday

08-22-2002, 10:12 PM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Harmonic Balancer Bolt I'm in the process of rebuilding my 68 327. My question is, is there supposed to be a harmonic balancer bolt in the crank, or is mine broke off in the crank. I tried looking at it and since it was painted over, I couldn't tell. I was thinking there was one, but after talking to a guy at work, he suggested I look into it more because he thought there was a certain engine that didn't. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-22-2002, 10:19 PM	#3
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	Some were a press fit, 327 would be about the right vintage for that. You could try running a tap though it and see if the might be there threads are really there. Not sure of the bolt size but Moroso's web site will have it listed __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

08-22-2002, 10:25 PM	#4
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	That's what I was told: it might be a press fit __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-22-2002, 10:27 PM	#5
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	just checked in my chilton's manual and yep, it's pressed on. Answered my own Q. Thanks though __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-22-2002, 10:33 PM	#7
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	There keyed on and around the time of the 350 they began to do the bolts as extra securety. __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

08-22-2002, 10:28 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	They are all pressed on, that's why you need a puller to remove, and an installer to install one. I may well be wrong on all of them needing bolts, but i see no way for it to stay on, let alone stay in the same position.

08-23-2002, 01:17 AM	#8
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Ive only seen a few 327's that had bolts to retain the balancer. The vast majority of 327's weren't even drilled for the bolt from the factory much less tapped . I even had one early 350 that wasn't drilled for the bolt. Ive never seen a 283 that was drilled for the bolt. It was a learning curve in the early years of the small block. Remember the 265's didnt even have an oil filter . __________________ No truck :-(

08-23-2002, 04:40 AM	#9
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	huh, learn a couple of new things everyday __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life



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