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the block casting number is 1241748. firing order is 18436572. the intake is 13.5" wide +/-. according to that block no. is a 73 buick 455. the guy that sold me the boat that the engine is in has always thought it to be a 73 buick 350. he even replaced main and rod bearing... buying themfor a 350 (been running for 20 yrs.). can anyone help me ID the CID of this engine
 
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