4.5 bore mark 4 block and cometic head gasket
 

Do they still make the 4.5 bore head gasket? All I can find is a 4.540 bore gaskets. Or one they call Mercury Marine 1050 Engine Gen IV & Dart Block 2 Bolt Intake Side of Gasket.

I am looking for a .020,.040.050 head gaskets from cometic. I am not sure if the dart block 2 head gasket is the same.

4.5
 

4.540 gasket is correct for 4.500 bore. The gasket is always slightly larger than the bore.