KRE MR-1 Block and High-Port Heads Build - Big-Inch Bracket Bruiser - Pontiac Tech
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Released in September 2006, the ductile-iron cylinder-liner-equipped MR-1A retains all the features of the MR-1 but is cast in lighter aluminum. The iron block weighs 238 pounds with a 4.350-inch bore with the main caps installed, and the aluminum block checks in at just 125 pounds. View Related Article
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