These AMC 401 4 bolt main caps have all the correct machining. The notch for the bearing, the thrust bearing surface, machined 5 hole oil drain back, provisions for large 7/16 splayed outer holes on the center 3 caps, machined oil pan rubber lip seal surface, machined rear main seal cavity. Highly precise setup and a great insurance for your AMC performance build. Need a 2 bolt only kit for your 290-390? Give a call 1-855-433-3689
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