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Old 08-01-2012, 06:29 PM
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They are low perf 305 heads.
They will run on your 283 but don;t expect much power.

If you want power froma 305 head on a 283 get some #4416 heads
and home port them 1.94x 1.60 valves help too.

Vortec heads work very well on 283's too.
mill .040" off the decks and install with a thin felpro 1094 gasket.

the 450 casting heads will be lame on any motor including 283's.
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