PerTronix Dougs Headers D380 - Manual (Page 2)

Part No. 0110-003113
Page 2 of 3
rev 1 7-19-12 DSL
6. Remove the rocker arm panel molding. The rocker panel will need to be modified as
shown in the illustrations. Due to variances in cars and years, we recommend that the
illustration only be used as a guide
– check fit parts before cutting or trimming.
INSTALLATION
DRIVER SIDE
1)
Starting from below, slip the driver’s side header up into position. Slip the gasket between
the head and the header and start all the header bolts but do not tighten at this time.
Install the Alternator /generator bracket if mounted on driver’s side at this time as well.
2) Install the muffler insert into the sidepipe. Install the rubber bushing into the tab bracket
on the sidepipe. Slip the sidepipe onto the header collector. Check the position of the
sidepipe brackets to the holes in the rocker panel. Trim the rocker panel as necessary.
Due to Chevrolet manufacturing tolerances, it MAY be necessary to slot the holes in the
sidepipe brackets in order for the sidepipe to slide completely onto the collector. This is
not usually required.
3) Insert the ‘T’ bolt into the hole in the rocker panel. The rubber bushing will slide over the
bolts and is secured with the flat washer and nut.
4) Tighten the header flange bolts to 35 ft lbs on iron heads or 18 ft lbs on Aluminum heads,
side pipe tab bolts and the pinch bolt on the front of the side pipe (15-17 ft lbs).
PASSENGER SIDE
1) From below, slip the passenger side header up into position. Slip the gasket between the
head and the header and start all the header bolts but do not tighten at this time. Install
the Alternator/Generator bracket if mounted on passenger side at this time as well.
2) If equipped with Air Conditioning:
a) 1965-76 will need A/C bracket #H7608.
b) 1963-64 models with A/C mounted on right side exhaust manifold will require a
Hedman Hedders bracket #20020. This bracket will need to be modified slightly by
removing approx. ½” from the front edge.
c) 1977 and later models will require reuse of the original A/C bracket and stud that fits
the front first bolt hole. Fabricate a 3/8” i.d. X 5/8” o.d. X ¾” long spacer to fit between
the header and the bracket.
3) Install the muffler insert into the sidepipe. Install the rubber bushing into the tab bracket
on the sidepipe. Slip the sidepipe onto the header collector. Check the position of the
sidepipe brackets to the holes in the rocker panel. Trim the rocker panel as necessary.
Due to Chevrolet manufacturing tolerances, it MAY be necessary to slot the holes in the
sidepipe brackets in order for the sidepipe to slide completely onto the collector. This is
not usually required.
4) Insert the ‘T’ bolt into the hole in the rocker panel. The rubber bushing will slide over the
bolts and is secured with the flat washer and nut.
5) Tighten the header flange bolts to 35 ft lbs on iron heads or 18 ft lbs on Aluminum heads,
side pipe tab bolts and the pinch bolt on the front of the side pipe (15-17 ft lbs).
6) Reinstall the Clutch Z bar, Spark plugs and wires, Alternator/Generator, and A/C
compressor,
7) Check all brake and fuel lines for clearance around headers and exhaust and relocate as
necessary.
8) Connect the negative battery cable.