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Full Size/Big Car
Pontiac V8 Full Size/Big Car
The Roomiest Install — Full Size/Big Car for Pontiac V8s
Full size Pontiacs get left out of most header catalogs, which is a shame because the big car has more room under it than any A-body or F-body. A Catalina, 2+2, Grand Prix or Bonneville with a 326-455 will take a full-length header with far fewer fights than the smaller chassis.
Butler carries Doug's Headers four-tube full-length D-port sets for 1965-68 full size cars, with 1 3/4" primaries into a 3" collector, available in metallic ceramic, black painted and all-stainless.
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1. What fits a big car
The fitment here is specific and worth reading twice before you order.
| 1965-1968, 326-455 | Doug's lists this D-port header for Catalina and 2+2, Grand Prix and Bonneville. That is the range Butler stocks for the full size chassis. |
| 1 3/4" primary, 3" collector | one tube size, and it is the right one. A big car is heavy and geared for torque, and a 1 3/4" primary keeps exhaust velocity where that combination lives. |
| D-port only | these are D-port flanges, matching the factory head shape on most full size Pontiac V8s. If your car has round port iron, you are outside this listing and should call. |
2. Choosing the finish
| Metallic ceramic | pre-polished, then given a metallic ceramic thermal barrier coating polished to a high luster, rated by Doug's for corrosion and heat resistance up to 1400 degrees. On a full size car with a big engine bay and a lot of sheet metal holding heat, this is the version worth having. |
| Black painted | Doug's notes that the black finish is painted, not a heat-coated paint. It is the least expensive way in and it looks correct, but it does nothing for under-hood temperature. |
| All stainless | the same 3/8" thick machined flanges, CNC mandrel-bent tubes and long transition collectors in stainless, for a car that sees weather. |
3. What comes next
A big car header dumps into a 3" collector, and most full size Pontiacs left the factory with a single or an undersized dual system behind it. Plan the pipe at the same time you plan the header, and remember that a full size car is the one Pontiac chassis where a genuine 2.5" dual system fits without creativity. If you would rather keep the stock look under the car, the factory-style Ram Air exhaust manifolds in our Ram Air Exhaust Manifolds section are the other path, though they are cast for A-body and F-body applications. Call the shop with your year and body and we will tell you straight which route makes sense.
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.