Civic Si Parts

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Senior Member
Anyone know why I need a VX timing belt and HX spark plugs for my 95 Civic DX D16Z6 head swap? If no one can put up an argument, I'll just get the Si ones, I can't figure out why I would need 'em.
VX timing belt --- not sure ... probly length or something
HX spark plugs --- probly a colder plug ... protects against detination in high compression situations