over sized head gasket?

[Biddington]

Im boring my cylinders 3 over and cant seem to find a 3 over sized head gasket, can i just use a stock head gasket? any help would be appriciated.

thanks,
stephen

 

[5twins]

I'm pretty sure that's all you use for the standard over-bores. Each over-size is only 1/4 of a MM. You do use a different head gasket for the big bore kits like the 750.