Doug's headers feature heavy wall construction with 3/8"-thick mounting flanges, ensuring durability and longevity under the most demanding circumstances. All the necessary mounting hardware is included with each set: bolts, gaskets and reducers.

DHD305C - 265-400 SB with AC, PB, PS, MT floor shift 1-5/8" tubes, 3" collector, oval port Application notes: 5, 36, 92, 93, 96 DHOD330 - 265-400 with AC, PB, PS, AT 1-3/4" tubes, 3" collector, SAP Application notes: 92, 205, 209 DHOD318 - 396-502 with AC, PB, PS, AT 2" tubes, 3-1/2" collector, SAP Application notes: 210 DHOD336 - 265-400 SB with AC, PB, PS, AT/MT floor shift 1 3/4" tubes, 3" collector, oval port Application notes: 17, 36, 93, 96, 214 DHD370Y - 265-400 SB with AC, PB, PS, AT/MT 1 5/8" tubes, 3" collector, oval port Application notes: 17, 36, 93, 96, 126, 133 Application footnotes: 5. Shorty design for maximum ground clearance 17. Fits most angle plug heads 36. Fits D-Port heads including ZZ4 crate engines 92. Will fit most angle plug heads including factory Chevrolet Bowtie heads 93. Requires removal or modification of locking steering columns if equipped 96. Installation requires use of 79 or later AC compressor bracket and short compressor 126. Tri-Y Design 133. Does not fit with Powerglide transmission 205. Will fit 168-tooth flywheel is used with Powermaster mini-starter# 9500/OPGI# CH26244 209. One tube each side over frame 210. Must use stock small-block frame stands and motor mounts 214. Must use non-shell type motor mounts