4.0 cam question

[Micah Chambers]

I have herd that you can put a 4.2 cam in a 4.0 and it will work and give more power. Is this true?? And is there anything that would need to be done to the computer on a 98 TJ if I put it in it?

 

[Bounty__Hunter]

Never heard of it. Many use a 4.2 crankshaft in the 4.0L engine to make a stroker engine, final displacement in the 4.6L range.

 

[PoliceMonkey161]

I don't really know for certain, but I tend to doubt it would work. The pulley snout is about 2" longer on a 4.0, I think the 258 crank would be to short.

 

[Micah Chambers]

I don't really know for certain, but I tend to doubt it would work. The pulley snout is about 2" longer on a 4.0, I think the 258 crank would be to short.

I meant the cam not the crank sorry

 

[Utah_jeepster]

your lobe grind on a 4.0L cam is a better profile and set for performance than an earlier model 4.2 cam lobe grind. Your better off changing your 1.5 rockers for a 1.6 rocker on a 4.0L cam.

 

[Micah Chambers]

Check this out. This is where I saw it. http://jeep4.0performance.4mg.com/stroker.html

 

[Micah Chambers]

your lobe grind on a 4.0L cam is a better profile and set for performance than an earlier model 4.2 cam lobe grind. Your better off changing your 1.5 rockers for a 1.6 rocker on a 4.0L cam.

Check this out. This is where I saw it. http://jeep4.0performance.4mg.com/stroker.html

 

[Utah_jeepster]

Stroker kits or stroking a motor requires that you change the crank for more throw on the piston, not the cam unless a different profile is needed. Your original question is changing in a 4.2 cam into a 4.0L motor.