Header Bolts

What size are the bolts that are on the exhaust manifold that go into the block? Exact size and dimesions. Also, can I use a OEM gasket for an aftermarket header?

Yes you can use an OEM gasket... try lining it up with new header and trim anything that overhangs openings....

As for bolt size/lenght... I dunno.. if I come across it before someone else I will post it... otherwise call a mitsu shop for the info... if they don't know they are lying..

you mean in the head,should be 8mm if i remember correctly.