George,

   Bill is correct of course about rolled threads being the way to go but here

in the middle of the USA availability and affordability are a problem.......I do

not have my 12A bolts in front of me at the moment and will have to double

check if the threads are proud of the bolt diameter on the ones I have.........

 

--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2

Kelly,

 If someone can find how long the bolts need to be I can see if we can find a source to mail order them. ARP fasteners are a high quality automotive source. WWW.ARP-bolts.com

We should check to see if they will make studs to replace the 13B bolts.

Bill Jepson