starter clutch bolt length

[Flatline_Racing]

When you rebuild a starter clutch and upgrade the bolts what length should a guy use? I have one rebuilt by the PO and it had 20mm bolts but you can still see a few threads in the hole on the rotor side. Would 25mm be too long? My guess is that it would stick past the rivits by a mm or 2. I could always cut/grind them down if they are too long.

Thanks

[sparki]

length isn't so much the issue as is the tensile strength of the bolt... go for 12.9 and tighten to spec with thread locker.... then tweek it a lil more for good measure. some folks weld the back on the bolts in but imho for a street motor that's overkill