were are the #'s i have to decode on my heads. i want to find out were there from

They are under the valve covers and inbetween the valves.

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Robert
72 SS Camaro
73 Formula
77 z28
________
Honda civic (first generation) (http://www.honda-wiki.org/wiki/Honda_Civic_(first_generation))

When you get the numbers try this site.
http://hp-car.com/block/