Al things being equal ( valve size flow and compression) the 5C heads make more power due to the smaller openings of the exh crossover passage on the center two exh ports!
Oil temps also run cooler due to the air gap hole above the crossover passage.
If you step up to the 1.77" valves in the 5C heads cutting the seats to fit the new valves will cut thru the factory induction hardening and and make the need for seat incerts a MUST!!!
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