Well, I remembered 6 & 3/X... 
harmonic balancer diameter
Melting Slicks
Joined: Apr 2002
Posts: 2,620
Likes: 0
From: 20 forward gears to shift through in MD
Originally Posted by vark_wso
Does anyone have the diameter of the OEM harmonic balancer on base engine, 327/300HP engine, 1966 or 67? Thanks.
But then again I don't recall for sure...I should add that I believe the 350hp version balancer was 8"...
Last edited by Denney; Dec 13, 2004 at 10:56 PM.
Melting Slicks
Joined: Nov 2002
Posts: 2,460
Likes: 5
From: Wheaton IL
RLH,
None have fins like the original - that's why the originals are so friggin expensive. GMPP does make one that is very close to the original without the fins -- think you can pick it up for about $90.
Whatever you end up buying make sure the crank keyway to timing mark relationship matches your timing chain cover and tab. I think the variations in keyway to timing mark is a major cause of timing issues.
Brian
None have fins like the original - that's why the originals are so friggin expensive. GMPP does make one that is very close to the original without the fins -- think you can pick it up for about $90.
Whatever you end up buying make sure the crank keyway to timing mark relationship matches your timing chain cover and tab. I think the variations in keyway to timing mark is a major cause of timing issues.
Brian
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,056
Likes: 553
From: Sun Prairie WI
Mine sure seems to be closer to 6" even -- maybe 6-1/16" at the most. Things are rather cluttered with belts/pulleys/pump & hard to get at accurately for the moment. I think it is OEM, but that's what I'm trying to verify. My GM parts catalog shows 3896903 is for only '66 & '67 w/base engine, although I can't locate any numbering on mine. Other midyears & spec/HP show different p/ns in catalog. Does anyone have example out or perhaps on an engine stand that they could measure? Thanks.
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Team Owner
Joined: Oct 2000
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From: Washington Michigan
'58-'61 283's and '62-'65 327/300 and below were 6"; '62-'65 327/340hp and more were the 8" "finned"; '66-'68 327/300 were 6-3/4"; '66-'68 327/350hp and '69-'82 350's were 8" non-finned (this one is still available from GM).
'66-'69 hydraulic-lifter 427 BB's used a 7", solid-lifter 427 BB's used several different 8".
'66-'69 hydraulic-lifter 427 BB's used a 7", solid-lifter 427 BB's used several different 8".
