Pro 5000 Series, Custom - Original Chev BB design for naturally aspirated and light nitrous applications. 7/16" ARP rod bolts. .927" to .990" wrist pin, 2.125" to 2.325" big end. Any reasonable length.
Std. 5300 Series Custom - Original Pro Mod nitrous design with bulbed pin end and shallower beam pocket. 7/16" ARP rod bolts. .927" to 1.094" wrist pin, 2.125" to 2.325" big end. Any reasonable length.
Pro 5300 Series, Custom - Original Pro Mod nitrous design with bulbed pin end and shallower beam pocket. 7/16" ARP rod bolts. .927" to 1.094" wrist pin, 2.125" to 2.325" big end. Any reasonable length
Std. 5500 Series, Custom - Latest heavy (3 stage) nitrous Pro Mod design with added material on big end. 7/16" ARP rod bolts. .927" to 1.094" wrist pin, 2.125" to 2.325" big end. Any reasonable length.