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AMC V8 engine
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=== AMX 390 === [[File:1968 AMC AMX yellow 390 auto md-er.jpg|thumb|right|The AMX 390 engine in a 1968 [[AMC AMX|AMX]]]] The {{cvt|390|CID|L|1}} AMX engine had a bore and stroke of {{cvt|4.165x3.574|in|mm}}. It received heavier main bearing support webbing than the smaller AMC V8s, as well as a forged steel crankshaft and [[connecting rods]]. Forged cranks and rods were used for their known strength—there was inadequate time for testing cast parts for durability without delaying AMC's introduction schedule. Once forging dies were made it was not cost-effective to test cast parts due to the relatively low number of engines produced. The use of these stronger components was also continued with the production of 401 engines. This is an advantage of these AMC engines when used in heavy-duty and high-performance applications because they have no problems with their connecting rods breaking; unlike other domestic automakers' large displacement small block engines.{{cn|date=April 2021}} The Gen-2 AMX 390 produced {{cvt|315|hp|kW PS|0}} and was built in 1968 and 1969.
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