Harmonic balancer size on 4.3L carb engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86-C10-V6 · 11-22-2002, 04:52 PM

I am planing to do some work on my distributor, new weights and springs and the crane adjustible vacuum advance.
I would like to add a timing tape to my harmonic balancer to allow me to setup the timing but I can't find out what the diameter is on the harmonic balancer.
I have not tried to measure it yet, but I have found a reference on the internet(parts search) that suggest that it is 6 and 1/8 inches.
I can not find a timing tape that is designed for this size harmonic balancer.
This is somewhat complicated by the fact that my engine was replaced in 92 with a GM long block and I remember the mechanic that did the install said the engine had been upgraded to roller cam. I am not sure if the harmonic balancer is the same as the original engine.
Anyone have experience with this engine that can make some suggestions?
Thanks in advance.

**swervin ervin** · 11-22-2002, 07:28 PM

I believe it's the same as the 6.75" damper found on SB V8's.

11-22-2002, 04:52 PM	#1
86-C10-V6 Shadetree Mechanic Join Date: Oct 2002 Location: Youngsville, NC Posts: 100	Harmonic balancer size on 4.3L carb engine I am planing to do some work on my distributor, new weights and springs and the crane adjustible vacuum advance. I would like to add a timing tape to my harmonic balancer to allow me to setup the timing but I can't find out what the diameter is on the harmonic balancer. I have not tried to measure it yet, but I have found a reference on the internet(parts search) that suggest that it is 6 and 1/8 inches. I can not find a timing tape that is designed for this size harmonic balancer. This is somewhat complicated by the fact that my engine was replaced in 92 with a GM long block and I remember the mechanic that did the install said the engine had been upgraded to roller cam. I am not sure if the harmonic balancer is the same as the original engine. Anyone have experience with this engine that can make some suggestions? Thanks in advance. __________________ Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok

11-22-2002, 07:28 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	I believe it's the same as the 6.75" damper found on SB V8's. __________________ Mike 1985 Chevy C-10



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