318/340 harmonic balancer

Discussion of the 331-354-392 HEMIs.

Moderators: scottm, TrWaters, 392heminut

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johnny5
Posts: 128
Joined: Mon Dec 05, 2005 3:52 pm
Location: St Charles, MO

318/340 harmonic balancer

Post by johnny5 »

What exactly do you have to do to a small block damper to use it in a CHrysler hemi?
TrWaters
Posts: 390
Joined: Fri Dec 14, 2001 6:00 pm
Location: Vermont
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Post by TrWaters »

Be sure the balancer you decide to use is from an internally balanced motor. The late 340 and 360 are externally balanced, and the balancers are visually different.
I believe that some of the earliest balancers had the correct width keyway. Most you find do not, and you will either have to have the keyway broached, or use a stepped key ( which you can make, or purchased from a board member here :wink: )

Once you install it, be sure to check TDC by the piston, and mark the new balancer accordingly so that you have a correct 0 degree timing mark.
Early hemi to late sb Mopar trans adapters. Precision billet parts for early hemis.
budmspeeco
Posts: 133
Joined: Tue Dec 21, 2004 5:35 pm
Location: South Houston, Texas

318/340 harmonic balancer

Post by budmspeeco »

You have to broach a larger key way in the correct location so the timing mark comes up at t.d.c. The old groove is only about1/2 as wide as it needed to be and in the wrong place.. I am getting it broached a 1/4" wide so the mark is close to the correct T.D.C. We will see. LOL
'48 anglia
ANDY241
Posts: 21
Joined: Sun Oct 27, 2002 9:01 pm
Location: central texas

Post by ANDY241 »

Where can I buy the stepped key?
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