Bolt Spec

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sperera

sperera

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Not sure if this is the right place to ask this question but here goes.

Does anyone know the bolt spec of the two bolts that hold the exhaust onto the head? I lost some and would like to get some more from a bolt shop but would like the spec first so I don't look like an idiot :D
 
can't remember the thread size, but I'd take a stab at M4?
The torque spec isn't too high on thease, so 8.8 bolts will be man enough for the job.

10.9 will also be OK, but I would personaly prefer the 8.8 as being softer they can take more stretch as the header pipe expands, and will also me less likely to break if you land on teh exhaust (10.9 are stronger in tension, but more brittle).

aside, I wouldn't bother with any grade 4.6 bolts on a largescale as thease often have a poor threadform, and so aren't very good for regular disassembly (bad threadform will prematurely wear the hole thread)
 
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