HOOKER 1970-1974 E-Body Mopar Gen 3 HEMI Swap Instruction Manual

: June 3, 2024
: HOOKER

Table of Contents

Installation Instructions
COMPATIBILITY INFORMATION:
INSTALLATION:
Muffler and Tailpipe Hanger Brackets:
Documents / Resources

1970-1974 E-Body Mopar GEN3 HEMI Swap
P/N: BH23113 – 2.5” 304 Stainless Steel Exhaust System
P/N: BH23115 – 3” 304 Stainless Steel Exhaust System

Installation Instructions

Thank you for choosing to use HOOKER™ engine swap Exhaust Systems as part of your GEN3 HEMI Swap project. These Exhaust Systems are part of the most comprehensively engineered system of mounting components, headers and exhaust systems available for this application. Please read these instructions thoroughly before attempting installation.
IMPORTANT: This exhaust system is designed for use with under-axle sway bar assemblies and may not work with some over-axle sway bar systems.
Visit www.holley.com for a complete selection of Transmission Crossmember, Headers, Exhaust, and more GEN3 HEMI support products to complete your E-Body Hemi Swap.

COMPATIBILITY INFORMATION:

These exhaust systems were specifically designed to be installed with Hooker Blackheart HEMI swap engine and transmission mounting components and headers for this same application. Attempts to install these exhaust systems with any other type or combination of engine and transmission mounting components may cause them to not provide their intended ground or vehicle component clearances. Supporting Hooker Blackheart parts required for use with BH23113 & BH23115 exhaust systems:
Hooker Blackheart Headers – BH2358
Engine mounting Brackets – BHS566
Transmission Crossmember – BHS567
Transmission Adaptor Plate – BHS568 (727), BHS569 (NAG1), BHS570 (8HP70), BHS591 (8HP90), BHS592 (Tremec GM TKX)
Transmission Mount – 71223029HKR (or any standard 2-bolt Chevy Mount of the same design)

PARTS LIST:

Parts List

Qty| Description
1| Left Header Link Pipe
1| Right Header Link Pipe
1| X-Pipe
2| Mufflers
1| Left Over-Axle Pipe
1| Left Tailpipe Adapter
1| Right Over-Axle Pipe
1| Right Tailpipe Adapter
2| Polished Stainless Tips
Accessory Pack Contents

Check the hardware package. If anything is missing, please contact Technical Service at 1-866-464-6553 or 270-781-9741.
TOOLS NEEDED:
3/8” Standard Socket set to 7/8”
15mm Deep Socket
Drill
13/64 Drill Bit
Center Punch

INSTALLATION:

These instructions assume the engine, transmission, and BH2358 headers are installed.
BEFORE STARTING:
Your vehicle must be raised a minimum of 18 inches. A floor hoist is ideal. If no hoist is available, we strongly urge the use of axle stands as a safety measure. Please read and understand these instructions and disclaimer in their entirety before attempting installation.
CAUTION! WORK ONLY ON A LEVEL SURFACE. USE JACKS /JACK STANDS OF SUFFICIENT CAPACITY TO LIFT AND SUPPORT YOUR VEHICLE. NEVER WORK UNDER A VEHICLE SUPPORTED BY A FLOOR OR BUMPER JACK.

Install one 3” exhaust coupler onto each header collector.
Align the Left (driver’s) and Right (passenger’s) header link pipe with the straight end of the pipe with the least amount of bend to the header collector. The end with more bend will connect to the X-pipe. Even though the pipes look very similar, they will only install correctly one way.
Align the 3” exhaust coupler with a 50-50 split over the header collector and the header link pipe and tighten the coupler to allow for adjustment of the link pipe (Figure 1).
Install a 2.5” or 3”exhaust coupler (depending on the kit you have) on to the outlet of each header link pipe.
Install the X-pipe assembly and align the X-pipe inlet to the header link pipe. Support the X-pipe at both ends.
NOTE: The X-pipe should be installed with the longer leg of the X-pipe to the passenger’s side muffler.
Slide the couplers from the header link pipe on to the X-pipe inlet. Align with a 50-50 split between the header link pipe and the X-pipe. Tighten to allow for adjustment. Keep the X pipe supported.
Align the header link pipes and X-pipe for adequate clearance on the transmission crossmember and floor pans. Start with a fingers width between these areas. Tighten the band clamps when all components are straight and level with good clearance.
Install a 2.5 or 3” band clamp onto the inlet and outlet of each muffler.
NOTE: Keep the outlet end of the X-pipe supported to avoid unnecessary weight on the exhaust components and headers until the exhaust hangers are installed

Muffler and Tailpipe Hanger Brackets:

Remove the existing left and right muffler and tailpipe hanger assemblies and clip nuts from the vehicle.
Remove the center seat belt anchor bolt from the rear seat belts.
Replace the anchor bolt with the provided 7/16-20 x 1.5” bolt and tighten until the bolt just bottoms on the shoulder of the bolt or the seat belt anchor plate stops rotating. Then, back off ½ turn to allow the anchor plate to move. This will provide a convenient mounting point for the muffler hanger to be mounted (Figure 2).
Pre-assemble the tailpipe hanger brackets with the provided rubber isolator using the 1.75 long ½” bolt and lock nut with the washer against the rubber isolator (Figure 3). NOTE: Do not over tighten or compress the rubber isolator.
To install the tailpipe hanger assembly as shown in Figure 4, hold the tailpipe hanger assembly on to the frame rail in the location shown. Measure from the center of the hole to the edge of the hanger bracket and mark the location of the slots in the bracket with a sharp awl or scribe. Make sure the ½” nut is tight against the frame rail during this process
Mark the center of each slot with a center punch to be drilled in step 8.
Repeat steps 5-7 for the driver’s side tailpipe hanger assembly. Hanger Brackets:
Using a 13/64 drill bit, carefully drill at the center punched marks in the frame rail, being careful not to let the drill bit wander off center.
Use the supplied ¼-20 thread cutter bolts and anchor the tailpipe hanger bracket to the frame rail as shown in Fig.5 and Fig.6.
An impact driver can be used to start the thread cutter, but DO NOT tighten the bolts with an impact driver. Apply lock tight to the threads of the bolt and tighten by hand to approximately 20ft lbs.
Install muffler hanger rod assemblies (Figure 7) on to the 7/16-20 bolt at the seat belt anchor installed previously (Figure 8).
Install the hanger assemblies with the hanger rods facing outwards, install the 7/16 Lock nut and tighten (Figure 8).Mufflers and Tailpipes:
Install the mufflers onto the X-pipe outlet (Figure 1).
Tighten the clamps on the X-pipe side of the muffler enough to hold the mufflers level while the tailpipes are installed.
Install a rubber isolator on to each muffler hanger rod (Figure 9).
Install a clamp over the muffler outlet and install the over-axle pipes with the short pipe into the muffler and the hanger rods facing inward (Figure 9).
Install the rubber isolator over the hanger rod and tighten the clamps to hold the over-axle pipe, but still allow adjustment.
Install a clamp on to the left tailpipe adapter expanded end. Install the expanded end of the tailpipe adapter on to the overaxle pipe with the hanger rod facing outward. Insert the hanger rod into the rubber isolator (Figure 10).
Tighten the clamp to allow for adjustment.
Install a clamp onto the stainless steel tip expanded end and install it on to the adaptor and tighten the clamp to allow for adjustment.
Repeat steps 14-20 for the right side tailpipes.Final Adjustment:
Adjust the tailpipes for best clearance and alignment starting at the headers and working rearward. Tighten all the clamps and couplers as you go.
Once the alignment is complete, install the locking washers on to the hanger rods with a deep socket to hold the rubber isolators in place.

NOTE: It is normal for the Blackheart Exhaust System to emit smoke for the first few minutes during the break-in period. Re adjustment of the tail pipes is common after the first couple heat cycles. Any questions? Please contact Technical Service: 1-866-464-6553 or 270-781-9741. For online help, please refer to: www.holley.com.
LIMITATION OF LIABILITY – DISCLAIMER: The regulation of emissions production, noise levels, and safety standards is undertaken by the federal government, each of the fifty state legislatures, and by many local municipalities, towns, and counties.
HOOKER™ makes no warranties of merchantability, of fitness for particular purpose, or that its products are approved for general use, or that its products comply with laws, regulations, or ordinances in the state where they may be sold to the ultimate purchaser, the consumer.
Unless expressly stated to the contrary in the catalog, instruction sheet; or price list, the entire risk as to the conformity of any company product in any such state and as to repair should the product prove to be defective or non- conforming, is on the retail purchaser, the buyer, the ultimate consumer, of such product and it is not upon the seller, distributor, or manufacturer. In this connection, the retail purchaser, the buyer, the ultimate consumer assumes the burden of the entire cost of any and all necessary service, alterations, or repair. THE FOREGOING STATEMENT LIMITS THE LIABILITY OF THE MANUFACTURER. California vehicle code, sections 27156 and 38391, prohibits the advertising, offering for sale, or installation of any device, which modifies a vehicle’s emission control system, unless exempted, unless otherwise noted. HOOKER™ Headers that have not received an Executive Order (E.O.) exemption from these code sections are not legal for sale or use in California on vehicles originally equipped with catalytic converters, except for racing vehicles, which may never be driven upon a highway. Check with your local authorities to determine if these headers are legal for use in your particular area. Technical Support: 1-866-464-6553

© 2021 Hooker Headers, Inc. All Rights Reserved. Tous Droits Réservés.
199R12238
Date: 6-23-21

Documents / Resources

| HOOKER 1970-1974 E-Body Mopar Gen 3 HEMI Swap [pdf] Instruction Manual
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