Post by
themadscientist »
https://forums.nicoclub.com/themadscientist-u2806.html
Wed Jan 31, 2007 3:56 pm
The head casting, again according to a guy who worked with them that I spoke with, was different with smaller ports. If it was in fact different which would make sense since the intake is completely different there is a possibility that the head bolts could be of a smaller diameter than the S13 ones. I had to drill and tap the holes in the CA20 block to get the S13 head bolts in and the early DOHC CAs were of the same vintage so there is a possibility, again just speculating here, that the S12 DOHC had the same small head bolts.