Bob,
Sorry about taking so long getting back to your question.
I finally did some digging out in the shed to confirm the
thread sizes.
FLYWHEEL:
10mm x 1.50 thread x 20mm long. You need TWELVE of those
flywheels bolts for the U20. Check with the roadster vendors
as to what they have available. NLA from Nissan, and do NOT
use unknown bolts from a hardware store for this use.
TRANSMISSION flange to U20 ENGINE:
Once again 10mm x 1.50mm thread.
I would *GUESS* the bolts are about 45 to 50m long. You want
the bolt to have atleast 1.5 times the thread diameter. So with
a 10mm bolt, you should have at least 15mm of thread sticking out
of the transmission flange when you test fit the bolt.
Usually I like threading the bolts by hand, with no washers on
them, to insure they do not "bottom out" in a blind hole. Then
remove and reinsert with the washer.
Once agai the OEM item with a 14mm head. Much easier to remove
and install. Aftermarket bolts will have the larger 17mm head.
Not as much clearance room for a socket.
Sorry I don't have anything more exact, but hopefully that
should get you in the right direction.
Cheers,
Tom Walter '68 2000
Austin, TX
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