ARE THERE ANY NUMBERS FOR H.P. GAINS USING THE CLIFFORD PERFORMANCE HEADERS (55-0010) OR THEIR RAM FLO INTAKE (45-4500)

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1973 dart custom 225 4 dr

Not enough info here...
If you install a 4 bbl and headers onto a stock 225 you will not see much gain.
If you use those parts along with a better cam, increased compression and cylinder head porting, you can gain a good amount of additional HP
DD

If you call Clifford I bet they will give you all kinds of info! Wait about three weeks call them again and they will give you all kinds of new info!

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66 Lil' Red Piggie Valiant (Mater Crusher) - Thanks Zilla!!!!! 72 Demon (Number 1 Son's)