Aftermarket Chrysler Small Block Circulating Water Pump Aftermarket Chrysler Small Block Circulating Water Pump Part#: S-18-3581 Bi-Directional For: Engine Models 318, 340 & 360 Interchange: Chrysler Inboard 3004886 3619542 3745985 4417905 GLM - 15500 Mallory - 9-42602 MES - WP307M MSRP: Was: Now: $589.40 Add to Cart