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Old 09-27-2002, 06:55 AM
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Question Harmonic Balancers

Hopefully another simple question for the board:

What is the determining factor regarding balancer selection. 6 3/4 or 8 inch? The motor was originally a (made in Mexico) 350 crate motor. It has been mildly hopped up. Are there any benefits one over the other?

Thanks,

Paul

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Old 09-27-2002, 07:41 AM
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I have an 8" on the 350 I'm going to install this weekend, hopefully. This was original equipment for this engine.

Be aware that timing tabs for 8" balancers are hard to come by aftermarket wise, I've had a hard time anyway.

I had a post on the same subject several weeks ago but not many responses.

I've herd both good and and bad. Maybe someone with more experience will respond.

If I find out more I'll post it.
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Old 09-27-2002, 10:28 AM
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Just curious...should the timing tab for the 6 3/4" balance be harder to find? Semms like 90% of balancers on small blocks are 8".
I had a 6 3/4" on my small block in my wagon until it decided it was time to come apart. The outer ring seperated from the inner ring that bolts to the crank. Only way I noticed was it was hitting the timing cover on the inside of the balancer. Replaced it with an 8" and haven't had any more problems.
Later,
WEIMER
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Old 09-27-2002, 11:17 AM
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Most of the timing tabs I've found were for 7", I wasn't looking for 6-3/4 so I'm not sure if they are harder to find or not.

The balancer I have on myy truck now is a 7".
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Old 09-27-2002, 11:37 AM
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the general switched to 8 inchers back in the 60's. figure they knew what they were doing. course they did put the dist. in the back. morons.
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Old 10-06-2002, 05:59 PM
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This may be a little late, but thought I would add anyway. 8" dampers were on several different motors. Par3s 3817173 and 3947708 had timing marks 2 degrees before crank key way. the first # was used on 62-68 small journal 302-327 engines (casting # 7173); the 2nd # was on 69 302 (casting # 7708). Part # 6272224 was on 70-74 350 z28, LT1,L82 and ZZ3 350/3h5HP crate motor (most likely yours), with casting # 2224. The timing mark is 10 degrees before crank keyway. The timing tab part number is 12341995 pr 12342011. Part number 627225 was on 70-80 externally balanced Gen 1 400 engines and sort of important not to mix and match!! No casting # shown in my book, but timing mark is also 10 degrees before key way. There is another one, part # 364709 that is a heavy duty nodular iron off road racing and goodies that might be of interest in a performance engine (like good to 8000RPM) Casting # is 4709 and is marked MALL, the abbreviation for malleable iron.

Good luck

Trees
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