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503 engine
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05-31-2014, 04:58 PM
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C10 - C90 Bill
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Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,067
Re: 503 engine
Great work.
I have sure heard of 503's but did not know that they were the opposite of the newer 6's (Distributor Side vs Exhaust Manifold Side).
Bill
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