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Old 01-07-2016, 08:17 PM
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Join Date: Jan 2016
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Performance Modifications for '66 M121 Engine

I am presently engaged in negotiating the purchase of a '66 200 with the M121 engine and 4-spd transmission. This 200 also has also the rare floor shift. I will be facing an engine rebuild and I would like to make some performance modifications that will allow me to retain the stock appearance of the engine (with the exception of the air filters}. I am considering milling of the head as well as a port and polish, a higher-lift camshaft and matching springs, rejetted carbuerators, balance all rotating assemblies, dual exhausts and lower gear ratio for differential.
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