[Early_S_Man]

The 20 mm stud I gave the length on was for a 2.4/2.7 engine with the thin exhaust flanges.

The longer 35 mm length was for the 'thick' flanges on SC exhaust systems.

Depending on what type of system is going back on ... early-style heat exchangers would need shorter studs, and thick-flange SSI's would need the longer studs.

Most hardware stores have all-thread M8 rods these days, but it isn't DIN 8.8 strength, so that is why I recommend cutting a longer-threaded DIN 8.8 bolt to make studs. Red Loctite should be used on the threaded portion in the heads ... after chasing the threads with a tap, and degreasing thoroughly with brake cleaner/degreaser. Anti-sieze compound should be used on the nuts!