phatdave

Hello,
I have a Z24 engine block,
a Z20S/W04 cylinder head (8-spark plug type),
a W10 intake manifold,
and a distributor with only 4 outlets.
I am experiencing overheating issues after running the engine for 10 minutes or less.
Can we conclude that the overheating is caused by this cylinder head?
Is it possible to modify the cylinder head?
I look forward to your reply.
Thank you very much.