head gasket trimming

My stock piston size is 39.9mm I believe and I upgraded to 42 mm. I cant find a 42 mm aluminum head gasket. and my sparkplug is angled so milling the head and gasket isn't easy. How do I trim my 39mm head gasket to be compatible with a 42mm piston? does anyone just use scissors?

Re: head gasket trimming

Dremel

Re: head gasket trimming

sand both sides even and run no head gasket.

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