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Old 07-11-2008, 05:48 AM
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I believe that gm used nine different balancers too. So make sure it is the right size and degree. I ran into this problem with the Performer rpm engine I built.

They had three timing locations 30*,10*, and 0*


PART No.
ENGINE
HUB SIZE
BAL SIZE
TDC LOC
DESCRIPTION

364709
302-327-350
6-1/4
8 x 1-3/4
10-Deg
Nodular Iron, Off Road

458653
267-305
4-3/8
6-3/4 x 1-11/16

Base Performance

3817173
302-327
6-1/2
8 x 1-11/16
2-Deg
High-Performance

3947708
302-327-350
6-1/2
8 x 1-3/4
10-Deg
Special Hi-Performance

6272221
305-350
4-3/8
6-3/4 x 1-3/16
10-Deg
Base Performance

6272222
350
6-1/4
8 x 1-1/2

Intermediate Performance

6272223
262-307
4-3/8
6-1/8 x 3/4

Base Performance

6272225
400 ONLY
6-1/4
8 x 1-1/2
10-Deg
Intermediate Performance

12555879
350
6-1/2
8 x 1-11/16
10-Deg
Used on LT-1, Z-28, L-82, and ZZ4




Fig. 44.2
There are three locations for the Timing Mark on the Harmonic Balancer. The early style balancer Pre-1969 have the Timing mark 2-degrees before the key way Center Line. The second Timing mark used from 1969 through the mid 80' is 10-degrees before the key way Center Line. The third Timing mark used is 30-degrees before the key way center line.
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