Jeep 4.2 intake manifold upgrade

Joined Mar 9, 2008

107 Posts

Discussion Starter · #1 · Apr 23, 2008

Hey a loacal salvage guy in my town has a 4.0L in his yard with no wiring, I blew my 4.2L up and can't find one anywhere, i was wondering if I can swap the intake manifold off my 4.2 and put it on the 4.0L and run it like that. If it will fit what kind fo problems will I run into? Jetting, timing and such....

Joined May 2, 2005

3,178 Posts

I am

Don't know if this helps, but I am running an 88 Yj 4.2 intake on a 96 4.0 head.
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Cams live

Joined Dec 20, 2001

560 Posts

Hey a loacal salvage guy in my town has a 4.0L in his yard with no wiring, I blew my 4.2L up and can't find one anywhere, i was wondering if I can swap the intake manifold off my 4.2 and put it on the 4.0L and run it like that. If it will fit what kind fo problems will I run into? Jetting, timing and such....

yes its doable with minor modifications. google "monsterslayer jeep", depending on your smog laws you can also go to an aftermarket 4 barrel intake and carb.

Joined Dec 11, 2006

928 Posts

Hey a loacal salvage guy in my town has a 4.0L in his yard with no wiring, I blew my 4.2L up and can't find one anywhere, i was wondering if I can swap the intake manifold off my 4.2 and put it on the 4.0L and run it like that. If it will fit what kind fo problems will I run into? Jetting, timing and such....

This will answer your question;

http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=277013

	Exhaust Manifold Log in to see price & stock Replaces Part #: J8124999 Price: (Log in to see price) Fits: Jeep CJ-5 (1972-1974) w/ 3.8L engine; without Emissions Pump. Jeep CJ-6 (1972-1974) w/ 3.8L engine; without Emissions Pump. Jeep CJ-5 (1975-1978) w/ 3.8L engine. Jeep CJ-6 (1975) w/ 3.8L engine. Jeep CJ-7 (1976-1978) w/ 3.8L engine. Jeep CJ-5 (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep CJ-5 (1975-1979) w/ 4.2L engine. Jeep CJ-6 (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep CJ-6 (1975) w/ 4.2L engine. Jeep CJ-7 (1976-1979) w/ 4.2L engine. Jeep SJ & J-Series (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep SJ & J-Series (1975-1979) w/ 4.2L engine.
	Manifold Gasket Log in to see price & stock Replaces Part #: J3242855 Price: (Log in to see price) Fits Jeep: Jeep Wrangler (YJ) (1987-1990) w/ 4.2L engine. Fits Vintage Jeep: Jeep CJ-5 (1966-1978) w/ 3.8L engine. Jeep CJ-5 (1971-1983) w/ 4.2L engine. Jeep CJ-6 (1966-1975) w/ 3.8L engine. Jeep CJ-6 (1971-1975) w/ 4.2L engine. Jeep CJ-7 (1976-1978) w/ 3.8L engine. Jeep CJ-7 (1976-1986) w/ 4.2L engine. Jeep CJ-8 (1981-1986) w/ 4.2L engine. Jeep SJ & J-Series (1965-1979) w/ 3.8L engine. Jeep SJ & J-Series (1971-1986) w/ 4.2L engine. Intake & Exhaust Manifold Gasket.
	Exhaust Manifold Log in to see price & stock Replaces Part #: J3237427 Price: (Log in to see price) Fits Jeep: Jeep Wrangler (YJ) (1987-1990) w/ 4.2L engine. Fits Vintage Jeep: Jeep CJ-5 (1980-1983) w/ 4.2L engine. Jeep CJ-7 (1980-1986) w/ 4.2L engine. Jeep CJ-8 (1981-1986) w/ 4.2L engine. Jeep SJ & J-Series (1980-1986) w/ 4.2L engine. If Without Emission Use Plug P/N G444618 (6 Plugs Needed).
	Exhaust Manifold Gasket Log in to see price & stock Replaces Part #: J3184277 Price: (Log in to see price) Fits: Jeep CJ-5 (1966-1978) w/ 3.8L engine. Jeep CJ-5 (1971-1979) w/ 4.2L engine. Jeep CJ-6 (1966-1975) w/ 3.8L engine. Jeep CJ-6 (1971-1975) w/ 4.2L engine. Jeep CJ-7 (1976-1978) w/ 3.8L engine. Jeep CJ-7 (1976-1979) w/ 4.2L engine. Jeep C104 Commando (1972-1973) w/ 4.2L engine. Jeep SJ & J-Series (1965-1979) w/ 3.8L engine. Jeep SJ & J-Series (1971-1979) w/ 4.2L engine. Intake Manifold to Exhaust Manifold Gasket.
	Exhaust Manifold Kit Log in to see price & stock Replaces Part #: 8124999K Price: (Log in to see price) Fits: Jeep CJ-5 (1972-1974) w/ 3.8L engine; without Emissions Pump. Jeep CJ-5 (1975-1978) w/ 3.8L engine. Jeep CJ-5 (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep CJ-5 (1975-1979) w/ 4.2L engine. Jeep CJ-6 (1972-1974) w/ 3.8L engine; without Emissions Pump. Jeep CJ-6 (1975) w/ 3.8L engine. Jeep CJ-6 (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep CJ-5 (1975) w/ 4.2L engine. Jeep CJ-7 (1976-1978) w/ 3.8L engine. Jeep CJ-7 (1976-1979) w/ 4.2L engine. Jeep SJ & J-Series (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep SJ & J-Series (1975-1979) w/ 4.2L engine. Kit Includes Exhaust Manifold and Gaskets.
	Manifold Kit Log in to see price & stock Replaces Part #: 3237427K Price: (Log in to see price) Fits Jeep: Jeep Wrangler (YJ) (1987-1990) w/ 4.2L engine. Fits Vintage Jeep: Jeep CJ-5 (1981-1983) w/ 4.2L engine. Jeep CJ-7 (1981-1986) w/ 4.2L engine. Jeep CJ-8 (1981-1986) w/ 4.2L engine. Jeep SJ & J-Series (1980-1986) w/ 4.2L engine. Includes Exhaust Manifold and Gasket.
	Stud Log in to see price & stock Replaces Part #: J4006547 Price: (Log in to see price) Fits Jeep: Jeep Wrangler (YJ) (1987-1990) w/ 4.2L engine. Fits Vintage Jeep: Jeep CJ-5 (1981-1983) w/ 4.2L engine. Jeep CJ-7 (1981-1986) w/ 4.2L engine. Jeep CJ-8 (1981-1986) w/ 4.2L engine. Jeep SJ & J-Series (1981-1986) w/ 4.2L engine. Exhaust Manifold to Down Pipe Stud.
	Choke Heater Tube Log in to see price & stock Replaces Part #: J3223024 Price: (Log in to see price) Fits: Jeep CJ-5 (1972-1974) w/ 3.8L or 4.2L engine; without Emissions Pump. Jeep CJ-5 (1975-1978) w/ 3.8L engine. Jeep CJ-5 (1975-1979) w/ 4.2L engine. Jeep CJ-6 (1972-1974) w/ 3.8L or 4.2L engine; without Emissions Pump. Jeep CJ-6 (1975) w/ 3.8L or 4.2L engine. Jeep CJ-7 (1976-1978) w/ 3.8L engine. Jeep CJ-7 (1976-1979) w/ 4.2L engine. Jeep SJ & J-Series (1972-1974) w/ 4.2L engine; without Emissions Pump. Jeep SJ & J-Series (1975-1979) w/ 4.2L engine.