LS1 LS2 LS3 LS6 LS Conversion Swap Headers (1960+ C10 Trucks) Mandrel Bent Tubing, CNC Machined Flanges Race Version, 304 Polished Stainless Steel, C10 Trucks 1 5/8" Primaries/2 1/2" Collector, Standard Graphite Manifold Gaskets Universal Swap Conversion Headers, (LS Engines Only) Does Not Fit SBC or BBC Engines Vehicles: 1960+ C10 Trucks Note: If using a larger 4L80E or older Turbo 350/400 transmission the bellhousing ears may need to be trimmed for proper clearance. Our headers are tucked in tight due to narrow older frame clearance.