PerTronix Dougs Headers D316 - Manual (Page 2)

0110-003102 Page 2 of 5 8-15-2011 DSL
2. If a car lift is not available, raise the vehicle 2 feet or higher and support it with adequate safety
stands. Make sure the vehicle is on a flat solid surface and is stable.
3. Apply penetrating oil to all nuts and bolts to be removed.
4. Remove and mark all spark plug wires and then remove all spark plugs.
NOTE: Grasp spark plug boot, not the wire, and use a twisting motion while pulling the wire
from the plug.
5. Disconnect the exhaust pipes from the exhaust manifolds and remove the manifolds. Remove
the Dipstick, Oil Filter, Clutch Linkage, Air Conditioning compressor, and Power Steering pump
if it is cylinder head/exhaust manifold mounted.
6. On Late 72-74 Chevelle/El Camino remove the frame support rods, the left side will not be re-
used, right side will be modified as shown in Illustration B. The left side motor mount will need
to be modified as shown in Illustration A.
7. Replace the spark plugs finger tight so debris will not get into the cylinders during the cleaning
operation.
8. Remove any gasket material or any carbon deposits that remain on the head surface. The use
of a gasket removal agent will ease the removal of any gasket material. We recommend the
use of a sharp gasket scraper to remove the bulk of material and to finish the operation with a
sanding block to provide a clean flat sealing surface.
9. After cleaning is complete remove the spark plugs again.
10. At this point it may be necessary to cut or remove the exhaust pipes to allow room to install the
headers. If you plan to reuse your existing exhaust, it is recommended that you remove the
exhaust and then cut it to fit after the headers are installed.
INSTALLATION
LEFT SIDE
1. Place a jack with a board between the jack and the oil pan to support the motor. Loosen the
transmission mount bolts or nuts. Remove the left side
motor mount and jack the motor up 2”
minimum. On late 72-74 Chevelle/El Camino modify the mount as shown in Illustration A.
2. Starting from below, work the header up through the chassis and into position.
3. Lower the engine back into position and replace the motor mount.
4. Start a bolt on each end of the header to hold in place. Do not tighten at this time.
5. With the header still loose, work the clutch linkage back into position.
6. Reinstall and fully tighten all linkages, transmission mount bolts, and the oil filter.
7. Slip the gasket into place and install all of the header bolts and lock washers supplied and
hand tighten. Tighten all the bolts evenly to a torque of approximately 35 Foot Pounds working
from the center outward.
8. See Illustration C (69-72) or D (73-74) to replace air conditioning compressor.
9.
1968 Chevelle/El Camino will require ¾” spacer on Power Steering pump bolt to head. See
Illustration E.
10. Re install oil filter, spark plugs and wires.
RIGHT SIDE
1. Late 72-74 Chevelle/El Camino only, modify the front cylinder header tube by denting slightly
as shown in Illustration F. Be careful when doing this as once you have dented the tube the
headers is not returnable.
2. Late 72 Chevelle/El Camino only, cut the upper control arm mounting bolts flush with the
nuts to provide header tube clearance. See illustration H.
3. Starting from below, work the header up through the chassis and into position. Start a bolt on
each end of the header to hold in place. Do not tighten at this time.