snora

what is the size of the triple square bolt used on the 951 cam sprocket?

Van

the "middle" size - between the CV joint and the flywheel bolt sizes...

I got a package of 3 bits from a local auto parts store - they're pretty junky, and I'd never use the small ones on CV joint bolts (I'd use a quality one for that) - but the other two do work for the camshaft and flywheel very nicely.

David Floyd

10mm

Tom M'Guinn

I'd start with a 1/4" drill bit and work your way up...

Bri Bro

So true.

Hardest bolt on the entire car to get off in one piece.

Josh B

+1 - don't know if I've met one yet that didn't have to be drilled out...

snora

anyone every get it out while assembly still on the engine? is there a allen head bolt that fits that?

LS1Porch

An impact gun on the back of a cheesehead will get it right off. I spent a few hours in a junkyard fiting with one though.