<VV> Yoke bolts

[D. Barry Ellison]

I'm about through fixing my 140 dropped valve seat problem.  Shoved the 
engine under the car last night.  This car is a daily driver that sees 
several autocross events each year and usually the NECC Time Trial with the 
convention and if I'm lucky one more high speed event somewhere.

Gosh, I'm getting old.  I only vaguely remember changing my differential 
yokes to 66+ style with 1/4-20 bolts.  (Aren't the 65s smaller?)  I used 
grade 8 bolts with lock washers and 7/16" heads.  The heads are larger than 
the originals and it's tough to get a socket on them.

Is there any reason I can't/shouldn't use an allen head with a flat washer 
and a split lock washer remember the 120+/- mph I do above?  Aren't they 
hardened or at least as tough as the grade 8s?  Are they too brittle?

Thanks,

Barry
Corsa SC
2 Lates, 2 earlies.
Live in Piedmont SC, work in Simpsonville SC