There would be no interest in replacing the spacer, but the 93-95

Torrington

thrust bearings are larger in OD. To use these, the front stationary gear,
front counterweight, thrust bearings, plates, and spacers must all be
changed to 93-95 parts. The spacer has a larger OD to center the larger ID
of the Torrington bearing. Note that the part numbers do not have the
thickness codes on them. In my case, the "A" spacer left no endplay; the

"C"

spacer left 0.0025" endplay; and the "E" spacer left 0.005" endplay. Spec

is

0.0016" to 0.0028".

Regards,

Rob

Yes. Perry Mick's engine being rebuilt by Mazdatrix as we speak is also
using
this upgrade to get the 93 and latter larger thrust bearings. Also I might
add if
you do this on the earlier engines with heavier rotors the engine needs to
be re balanced. Mazdatrix charges $190 for the re balance.

I was faced with the problem of converting an 87 six port to run the 93 style
thrust bearing system to meet a customer's requirements. The trick that I
came up with involved some machining to the counterweight and the selective
spacer, along with a custom .035" washer. The solution worked beautifully and
didn't require the changing of the front counterweight or rebalancing.
Bruce Turrentine

Perry is not sure they were entirely successful in re-balancing his engine. 
His subjective evaluation was it is not as smooth as the original engine. 
Mallory metal (whatever that is) had to be added to the 93 counter weight 
and welded in as Perry's rotor's were pre 89 and heavier than the 93 rotors.

Paul Lamar
 
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