• Recommended parts for the Jeep 4.6/270HP engine
• Recommended parts for the Jeep 4.6 Charger engine
• Jeep 4.2 to 4.6 liter conversion
• Oil Recommendations
• How to prime Jeep oil pump
• Installing the distributor in the in the Jeep 4.0

We build each engine to be a direct bolt in for your Jeep based on the year and casting number. The following recommendations will allow you to produce the proper level of hp when using our engines. The 4.6/270hp engine will still make about 260hp when using your stock header and throttle body but will jump up to the 270-285hp range when you add the aftermarket header, exhaust and 62mm throttle body. We sell all recommended parts and you can find them in our Jeep Parts Dept.

We give full tech support on our engines so if you have a question with your install please feel free to call us at 1-800-591-9171 ext 2

Keep in mind that it is mandatory for you to call us before you start the engine for the first time to ensure that the start up and break in procedure is properly understood.

Recommended parts for the Jeep 4.6/270HP long block

- 24lb fuel injectors

- 91 octane pump fuel

- 62mm throttle body

- Aftermarket header and exhaust

- Cold air intake

- DUI Firepower Ignition Kit which includes cap, rotor, Screamin Demon coil, Livewire spark plug wires (use your stock distributor.) This is not available for 2000-06 year models that use 6 coils.

- Champion RC9YC4 with gap set to .035".

- Valvoline 10/40 Conventional (Non-Synthetic) oil for break in (700 miles) we recommend using a Zinc additive with each oil change for the life of the engine. We also sell a Joe Gibbs Hot Rod oil for $75 a case that has high levels of Zinc present to get the job done even better.

- Wix or AC oil filter for a 4.0 Jeep (Do not use a Fram oil filter we have seen problems with them collapsing)

- Pilot bushing for a 4.0 Jeep Wrangler (For standard transmission applications only)

Recommended parts for the Jeep 4.6 Charger Engine

- Avenger Super Charger kit or 505 Products Turbo Kit

- 26lb Fuel Injectors

- 91 octane pump fuel

- 62mm throttle body

- Aftermarket head and exhaust

- DUI Firepower Ignition Kit which includes cap, rotor, Screamin Demon coil, Livewire spark plug wires (use your stock distributor.) This is not available for 2000-06 year models that use 6 coils.

- Champion RC9YC4 with gap set to .035".

- Valvoline 10/40 Conventional (Non-Synthetic) oil for break in (700 miles) we recommend using a Zinc additive with each oil change for the life of the engine. We also sell a Joe Gibbs Hot Rod oil for $75 a case that has high levels of Zinc present to get the job done even better.

- Wix or AC oil filter for a 4.0 Jeep (Do not use a Fram oil filter we have seen problems with them collapsing)

- Pilot bushing for a 4.0 Jeep Wrangler (For standard transmission applications only)

Jeep 4.2 to 4.6 liter conversion

- If you have a 4.2 engine in your Jeep and you would like to run our 4.6/270HP long block here is what you will need to do.

You will need to use the following parts from your 4.2 for the new 4.6 engine:
- Motor mounts
- Oil pan and timing cover
- Flywheel
- Brackets and pulleys
- Harmonic balancer

- Water Pump

- Distributor and coil

- Intake Manifold

You will need to buy the following parts for a 1991-1995 model year 4.0 Jeep engine in order to fit the new 4.6 into your Jeep:

- 4.0 header which we sell a Borla Stainless Steel version

- 4.0 Valve cover (we sell used covers for $75)

If you are using your stock 4.2 or aftermarket carb style intake you will need to make a modification to it in order for it to fit onto the 4.0 head.  You will need to take a small round file or a dremel and cut a half moon into the intake directly below the first and last bolt holes in the intake (the holes that will bolt the intake to the head). This will allow you to jack the intake up onto the half moon that you cut and line the port of your 4.2 intake with the port on the 4.0 head.

Keep in mind that the line up of the ports will not be exact in all cases but this does work without a problem. You will have to use the stock bolts and clamping hardware and in some cases need to fab small clamps to properly secure the intake.

If you are buying the Mopar Multi Port Fuel injection kit for your new 4.6 engine this mod has already been done by the factory.

If you are running a carb intake with this engine we do recommend a Offenhauser aftermarket intake and a Holley 450 cfm carb or equivlent.

 Oil Recommendations

          If you do not already know it the Jeep engine is one of the last modern day engines that still uses a flat tappet camshaft. This style of camshaft requires additional lubrication (Zinc)that is not present in todays oils. This is the reason that we highly recommend that you use a Zinc additive with every oil change. We sell a Zinc Additive for $10 that you can add into each oil change to give your engine the protection that it needs to last a very long time. We also sell a Joe Gibbs Hot Rod oil for $75 a case that has high levels of Zinc present to get the job done even better.

If you fail to use the Zinc Additive in every oil change you will risk the change of wearing a lobe off of the camshaft and polluting the entire engine with metal debris. You can read all about the importance of the Zinc additive courtesy of Joe Gibbs Racing Oils at the following link.

How to prime the Jeep oil pump

We sell a oil pump priming tool for the Jeep that you can purchase in our Jeep Parts Dept . You will run the oil priming tool with a 1/2 electric drill through the hole in the block that the distributor goes in. You will want to have your oil pressure gauge functioning at this point so you will know you are building oil pressure, it will take a few minutes to bring the engine to full prime.

Once you have finished priming the oil pump follow the instructions below on how to properly install the Jeep distributor. Feel free to call our tech line with any questions on either of these procedures.

Installing the distributor into a Jeep 4.0 engine

1. Ensure the #1 piston is at TDC on a compression stroke.
    
2. Look at the pulse ring on the distributor, note that there are two holes
    
3. Insert a 3/16" pin (an allen wrench will do) into the hole at the end of
   the pulse ring, the alignment pin needs to engage the hole in the distributor.
   
   Note: the hole that is "free" is to time the four cylinder engine, do not use for the six cylinder.
    
4. Preposition the oil pump to accept the distributor drive.
    
5. Inset the distributor, engaging the oil pump. 
   
   Note: The Rotor will NOT be aligned to the number 1 plug wire on the cap.
    
6. Remove alignment pin.
    
7. Install and tighten the securing bolt at the base of the distributor.
   
   Thanks to GES customer Dave Kaufman for this tip.
    

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