Description This high performance aluminum heat exchanger is specially-engineered for use with popular GM LS engines, and is designed to directly accept a Vintage Air condenser, simplifying system mounting. Double pass, crossflow unit features a natural finish. Part number:56-00019 *Designed for LT4 for driver-side hose routing. **Hose barb size: 3/4″ *Use PN:56-00015 for LSA or for passenger-side hose routing.