Stock 4.0L POWER

[Mopud]

Hey guys,

While the Wrangler stroker is on blocks getting its trans sorted, the 0331 head on my daily 2000 XJ decided it wanted to crack after 200,000kms.

So I'm presently rebuilding the top end and looking at a simple list of improvement mods that can be done while I've got it gutted.

1. I've sourced an aftermarket 0331 that my cylinder head guy is porting out a little for me. I'll keep standard valve sizes
2. Exhaust headers
3. Upgraded 4 hole injectors*
4. DEI fuel rail and injector heat shield kit*
5. Thinner head gasket* for slightly higher compression? - Unsure about this one on a stock engine.
6. Aftermarket copper/brass radiator
7. High flow thermostat*
8. TBS. I have a spare one sitting at home, i know they're largely considered as snake oil but i have one so I may as well throw it on.
* - Yet to be acquired

How does the above sound? Would you have any other recommendations? I'll keep the stock intake system.

Regards,

Anthony

[SkylinesSuck]

If the head is conning off and the radiator us coming out, it's only a couple small steps to swap the cam and lifters and put a new running chain on it.

[Mopud]

What cam for a stock 4L though? I do actually need to replace lifters so I would want one with the retention plate, not the pre 98 cams with the bolt, pin and spring.

[SkylinesSuck]

Sorry, no help for ya there. I'm sure somebody else will chime in though.

[Russ Pottenger]

What cam for a stock 4L though? I do actually need to replace lifters so I would want one with the retention plate, not the pre 98 cams with the bolt, pin and spring.

I'm late responding to your thread so I probably won't be able to help you out, but I do have a modified 68-232-4 that Comp builds for me with less lift that will work with a stock valve spring.

I have a special Cam bolt with a built-in delron nylon thrust button that replaces the factory thrust plate.
This allows for an upgraded double roller timing set that is only available for the earlier style Cams.

Russ Pottenger
Bishop-Buehl Racing Engines
531 N. Lyall Avenue
West Covina, California 91790
Work (626) 967-1000
Cell (626) 673-2203
Email/PayPal: [email protected]

[Mopud]

Great to know! Thanks Russ.

Yes this one is all sealed up and back on the road but I'll keep it in mind for next time.