Case through bolts -- which ones are these?
 

Was digging through some boxes of parts and found a pile of case through bolts... Been a while since I did a motor so looking for some guidance of which ones these are.

top one: shaft 222mm long, m10 fine thread (I think this is 993 through bolt 959-101-173-01)
next one down: shaft 233mm long, m10 course
next down: 233mm, m10 very fine
next: 233mm, m10 very fine

http://forums.pelicanparts.com/uploa...1420061774.jpg

http://forums.pelicanparts.com/uploa...1420061787.jpg

The fine thread through bolts were introduced in the 3.0 Turbo engines and carried over to the 3.0 SC and 3.2 Carrera engines. The course thread bolts were used on all non-turbo 911 engines prior to 1978.

Many engine builders prefer the fine thread bolts because they provide better torque control for the through bolts during engine assembly.

Thanks Tom...

Could someone confirm the top bolt?

Top bolt is from C-2, 964 and later
Bruce