Fits 1973-1974 GM C-10/20 2WD, 1-7/8", Long Tube Headers-Ceramic 70101504-1HKR in-tank-fuel-lines 5L V8 1970 Chevrolet Impala

5L V8 1970 Chevrolet Impala Base 250/4

1 L6 1981 GMC G3500 Rally 350/5

50-inch factory collector connections

Single pack connector kit includes: Connector

The mounting holes on these water necks are slotted to fit all model years of the GM (General Motors) LS Series engines

Fits 1973-1974 GM C-10/20 2WD, 1-7/8", Long Tube Headers-Ceramic 70101504-1HKR in-tank-fuel-lines 5L V8 1970 Chevrolet ImpalaHooker BlackHeart LS Swap Full Length Header Ceramic Coated; 1973 1974 GM C 10 20 2WD Trucks, Full Length LS Swap, 1 7 8", Collector Size 3". These Headers are designed for use with Standard 12621HKR engine mounting brackets. Features: For GM LS engine swaps into 1973 1974 GM C 10 20 2WD Trucks 1 7 8" primary tube diameter and 3" collector diameter ideal for "hot" LS1 LS6 LS2 or 5. 3L 6. 0L Vortec truck engine swaps Long tube design for optimum engine