D353-B Full Length Header
Product Information:
The D353 ~ 1955-57 Chevrolet 265-400 SBC Long Tube Headers are
designed to replace the factory exhaust manifolds in your vehicle.
These headers are made from high-quality materials and are
engineered to provide increased exhaust flow, resulting in improved
engine performance. The headers come with a set of gaskets, bolts,
nuts, and washers for easy installation. The product also includes
a set of reducers and Doug’s stickers.
Product Usage Instructions:
- Disconnect the negative battery cable before beginning
installation. - Remove the factory exhaust manifolds from your vehicle.
- From below, slip the driver’s side header into position. Using
the supplied header bolts, slip the gasket in place and start
header bolts at each end of the flange. Install remainder of the
bolts and tighten starting from the center and working
outwards. - From below, slip the passenger side header into position. Using
the supplied header bolts, slip the gasket in place and start
header bolts at each end of the flange. Install remainder of the
bolts and tighten starting from the center and working
outwards. - Replace the clutch linkage, dipstick tube, generator (bracket
part Number H7606/H7607 may be necessary), spark plugs and wires,
and the Idler arm to frame. - Bolt the supplied reducers to the headers using the gaskets,
bolts, nuts, and washers. - Connect the negative battery cable.
Installation Instructions & Warranty Information D353 ~ 1955-57 Chevrolet 265-400 SBC Long Tube Headers
REV. 7 5-9-22 DSL
DISASSEMBLY 1. Remove bolts attaching head pipes stock manifolds, then remove the stock manifolds 2. Remove the Oil Dipstick Tube, Starter, Clutch linkage (on std trans cars), Oil Filter, and Oil Filter Adapter. 3. Remove the Spark Plug Wires and Spark Plugs. Remove the Generator/Alternator. 4. Remove the Idler arm bracket from the frame. 5. Clean the cylinder head exhaust mounting surface. INSTALLATION 1. Starting on the Driver’s side, slip the header into position from the bottom. 2. Using the supplied Header bolts and lock washers, slip the gasket in place and start header
bolts at each end of the flange. Install remainder of the bolts and tighten starting from the center and working outwards. 3. From below slip the Passenger side header into position. 4. Using the supplied Header bolts, slip the gasket in place and start header bolts at each end of the flange. Install remainder of the bolts and tighten starting from the center and working outwards.
5. Replace the clutch linkage, dipstick tube, generator (bracket part Number H7606/H7607 may be necessary), spark plugs and wires, and the Idler arm to frame.
6. Bolt the supplied reducers to the headers using the gaskets, bolts, nuts and washers. 7. Connect the negative battery cable.
Parts List 1 Left side header 2 Header gaskets 18 3/8 Lock-washer 6 3/8-16 Hex Nuts 2 Collector Gaskets
1 Right side header 12 3/8 X 1″ header bolts 6 3/8-16 x 1 1/4″ Collector Hex head bolts 2 Reducers 2 Doug’s stickers
