Leon Promet wrote:

Rino,

Use the crownwheel bolts out of a Mazda differential (any of the early
rotaries (except the RX4 or RX5) and including the '79~'85 RX7,  and the
early E1300/E1600/E2200 Commercial Vans.  They are grade 12 (not 10),  the
correct thread,  have nice flanged shoulders on the heads,  and just happen
to be the right length!!  The later model stuff is even more bullet proof
in that they are 12 mm dia bolts.  But that necessitates drilling and
tapping.  I've put 650 BHP through the 10 mm diff bolts on AP and Tilton
twin plate racing clutches.  They are PLENTY strong enough.

Better to buy them new from Mazda, but if they can't supply,  scavenge them
for a wrecker,  but make sure that the diff hasn't been abused,  they might
have been overstressed.

Enjoy!!

Leon Promet

 
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