D590-B Full Length Header
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the following is the text from the user manual / instructions:
Installation Instructions & Warranty Information D590 ~ 1967-72 Pontiac GTO 326-455 68-72 LeMans/Tempest 326-455 Long Tube Headers
REV. 6 5-9-22 DSL
DISASSEMBLY
1. Disconnect the headpipes from the exhaust manifolds and move them out of the way.
2. If you are planning on reusing the headpipes, cut them approximately where the header
collectors will exit. If you are not reusing them, remove completely.
3. Remove the spark plug wires and spark plugs.
4. Remove the 6 manifold bolts from each manifold and remove the manifolds from the car.
Some Engines only have 4 manifold bolts from the factory. It is highly recommended that the other
two bolt holes on each head be drilled and tapped for bolts, otherwise header leaks will most
assuredly occur and there is no warranty against this.
5.
Remove the gaskets and any gasket material or any carbon deposits that remain on the
head surface.
6.
Remove the Starter motor, Clutch Linkage, Dipstick tube (if on the right side) and oil filter and
oil filter adaptor (place a drain pan under the filter area).
INSTALLATION
1. Starting on the passenger side. Remove the center bolt from the pass side motor mount. 2. Pace a flat board between the oil pan and a floor jack and lift the passenger side of the motor
approximately 2. 3. Working from below, slip the header carefully into position. Carefully lower the motor while
holding the header from getting damaged by the motor. 4. Reinstall and tighten the motor mount bolt. If the motor mount had a safety tab in the center
this will have to be discarded. 5. Slip the gasket between the motor and the header and install the supplied header bolts and
star washers STARTING with the 4th one from the front first. 6. Once all the bolts are started, tighten evenly working from the center outwards until all are
tight. 7. Reinstall the Oil filter adaptor, oil filter (Re-check the oil level), & Dipstick tube. 8. Reinstall the spark plugs and wires on this side. 9. Working from below, slip the driver’s side header carefully into position. 10. On some vehicles, the brake Distribution Block, MAY interfere with the L4 header tube. If this
Picture #1, Motor Mount Dimension Picture #2 Brake Line, Relocate from Arrow to Gray line area
PARTS LIST: 1 Left side header 2 Header gaskets 12 Lock-washer 6 3/8-16 Hex Nuts 2 3 Reducer gaskets 1 Oil Filter Adaptor Gasket
1 Right side header 12 3/8-16 X 1, header bolts 6 3/8-16 x 1 1/4 Collector Hex head bolts 6 3/8 Lock washers 2 3 Reducers
Installation Instructions & Warranty Information D590 ~ 1967-72 Pontiac GTO 326-455 68-72 LeMans/Tempest 326-455 Long Tube Headers
REV. 6 5-9-22 DSL
DISASSEMBLY
1. Disconnect the headpipes from the exhaust manifolds and move them out of the way.
2. If you are planning on reusing the headpipes, cut them approximately where the header
collectors will exit. If you are not reusing them, remove completely.
3. Remove the spark plug wires and spark plugs.
4. Remove the 6 manifold bolts from each manifold and remove the manifolds from the car.
Some Engines only have 4 manifold bolts from the factory. It is highly recommended that the other
two bolt holes on each head be drilled and tapped for bolts, otherwise header leaks will most
assuredly occur and there is no warranty against this.
5.
Remove the gaskets and any gasket material or any carbon deposits that remain on the
head surface.
6.
Remove the Starter motor, Clutch Linkage, Dipstick tube (if on the right side) and oil filter and
oil filter adaptor (place a drain pan under the filter area).
INSTALLATION
1. Starting on the passenger side. Remove the center bolt from the pass side motor mount. 2. Pace a flat board between the oil pan and a floor jack and lift the passenger side of the motor
approximately 2″. 3. Working from below, slip the header carefully into position. Carefully lower the motor while
holding the header from getting damaged by the motor. 4. Reinstall and tighten the motor mount bolt. If the motor mount had a safety tab in the center
this will have to be discarded. 5. Slip the gasket between the motor and the header and install the supplied header bolts and
star washers STARTING with the 4th one from the front first. 6. Once all the bolts are started, tighten evenly working from the center outwards until all are
tight. 7. Reinstall the Oil filter adaptor, oil filter (Re-check the oil level), & Dipstick tube. 8. Reinstall the spark plugs and wires on this side. 9. Working from below, slip the driver’s side header carefully into position. 10. On some vehicles, the brake Distribution Block, MAY interfere with the L4 header tube. If this
is the case, you will need to relocate the block and brake lines upward by about an inch or so. Failure to do so will result in the header not fitting. 11. Slip the gasket between the motor and the header and install the header bolts STARTING with the 4th one from the front first. 12. Once all the bolts are started, tighten evenly working from the center outwards until all are tight. 13. Reinstall the starter motor; make sure that the wiring does not come in contact with the header. 14. Reinstall the clutch linkage. 15. Reinstall the spark plugs and wires. 16. Bolt the supplied reducers to the collectors using the bolts, lock washers and nuts. Weld the existing headpipes to the reducers or fabricate new exhaust. 17. Connect the negative battery cable.
Picture #1, Motor Mount Dimension Picture #2 Brake Line, Relocate from Arrow to Gray line area
PARTS LIST: 1 Left side header 2 Header gaskets 12 Lock-washer 6 3/8-16 Hex Nuts 2 3″ Reducer gaskets 1 Oil Filter Adaptor Gasket
1 Right side header 12 3/8-16 X 1″, header bolts 6 3/8-16 x 1 1/4″ Collector Hex head bolts 6 3/8″ Lock washers 2 3″ Reducers
