PerTronix D316 User Manual

Corporate Office: PerTronix Inc. 440 E. Arrow Highway, San Dimas, California 91773 * Phone [phone] * FAX [phone] * www.dougsheaders.com

HEADER INSTALLATION INSTRUCTIONS

Part #D316

APPLICATION

1970-72 Camaro ~ 1968-74 Chevelle/El Camino

396-502 Big Block (Std. Deck Only)

NOTE: 68-74 Chevelle/El Camino MUST have correct Motor Mounts and Stands (frame brackets) for 350
or Big Block, L6/307 motor mounts and stands will NOT work.
NOTE: 70-72 Camaro MUST have Big Block Motor Mounts and Stands (frame brackets). Small block and
universal aftermarket will NOT work.
NOTE: 1973-74 Chevelle/El Camino have a narrower frame than the earlier years. Due to the large 1 7/8”

diameter of this header, it will be necessary to modify the #1 cylinder tube on the right side by denting it

slightly for clearance. If you are not comfortable doing this, we suggest you install Doug’s Headers part

#D313 with 1 ¾” tubes instead.

NOTE: Will NOT fit with 825 Saginaw Power Steering box (will work with 625 box)

PerTronix©

order to realize the full potential of our good fit, please read and understand these instructions completely prior to starting
work.

Check to make sure you received the proper parts for your application. The header number will be stamped on the
engine flange. If you are unsure you have received the proper parts call before you start work.

Be sure to work safe! Whenever you work under the vehicle be sure that it is located on level, solid ground and is
supported by adequate safety stands! Remember: Hot asphalt will not support most jack stands!

Many factors affect the installation of headers, some of which are broken or aftermarket motor mounts, accidents that
impact the configuration of the frame, and/or the installation of different engines or aftermarket cylinder heads. Most
installations require some welding. If you are uncomfortable with welding operations, we recommend that you contact a
professional exhaust system specialist to install your new headers.

Attention Customers breaking in new engines: Due to the extreme heat generated during the break-in process, the
appearance of the ceramic coating may be altered in certain areas. The protection characteristics and thermal barrier
properties of the coating is never compromised. It is recommended that a cast iron manifold or old set of headers be used
for this process.

Notice: The coating of these headers can be marred or scratched during installation. If the header needs to be returned
and is damaged, you will be charged for recoat.

thanks you for choosing

DOUG’S HEADERS

, the best fitting, highest quality header on the market. In

DISASSEMBLY

1. Disconnect the negative battery cable from the battery.

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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 re­used, 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.

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