The Novak Guide (Summary)
📖 Read the full article here
GM engine conversions into 1976-1979 CJ Jeeps are some of the most rewarding upgrades you can do. They’re well-documented, parts are easy to source, and the end result is stronger, cleaner, and more reliable power.
Swappers have been doing this since Chevy introduced the Small Block V8 in 1955 — and the process has only gotten easier since then.
Factory Setup
From the factory, these CJs used:
Recommended Transmission Options
Automatics:
Manuals:
Engine Choices
Most popular options include:
See also: Turnkey GM Powertrains.
Engine Mounts
Novak’s MMCJ-G3 mounts position Gen III+ engines perfectly in the CJ frame.
For other engines, our adjustable engine mount kits make placement easy and secure.
Cooling & Exhaust
Use a Novak conversion radiator designed for GM engines — stock Jeep radiators won’t work.
Tight-fitting block-hugger headers are recommended. If you’re in California, look for CARB-certified versions.
Clutch, Linkage, and Shifters
If keeping a mechanical clutch, use the #RAGM clutch arm.
For hydraulic setups, see the #HCR series slave retrofit kits.
For shifters, Novak’s cable shift systems and instructions cover each transmission setup.
Transfer Case and Crossmember
The Dana 20 is the most common and best option.
If you’re replacing a QuadraTrac, the Dana 18 provides the correct offset for your axle.
Mount it all cleanly with the Novak #RMU rear mount.
Fuel, Electrical, and Cooling
Use a high-pressure in-tank or inline fuel pump (38-50 PSI for multi-port injection).
Modern GM wiring and PCM systems are simple — treat the engine like it’s still in its original chassis. More info: GM PCM overview.
Final Thoughts
Swapping a GM engine into a CJ is one of the most transformative upgrades you can do.
The full guide walks through every step in detail — from engine placement to emissions and beyond.
For additional reading:
