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ProMaxx Performance Products CHR640N ProMaxx Performance Cylinder Head with Valvetrain for 91-06 Jeep Wrangler YJ, TJ, TJ Unlimited, Cherokee XJ, Grand Cherokee ZJ & WJ with 4.0L

Name: ProMaxx Performance Products CHR640N ProMaxx Performance Cylinder Head with Valvetrain for 91-06 Jeep Wrangler YJ, TJ, TJ Unlimited, Cherokee XJ, Grand Cherokee ZJ & WJ with 4.0L
Brand: ProMaxx Performance Products
Price: 937 USD
Rating: 4.5 (12 reviews)

ProMaxx Performance Products CHR640N ProMaxx Performance Cylinder Head with Valvetrain for 91-06 Jeep Wrangler YJ, TJ, TJ Unlimited, Cherokee XJ, Grand Cherokee ZJ & WJ with 4.0L

ProMaxx Performance Cylinder Head with Valvetrain

Quadratec Part #: 51108-1002

ProMaxx Performance Products Part #: CHR640N

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12 customer reviews

2 questions answered

Description

Restore horsepower, compression and fuel economy to that tired engine with one of our factory replacement heads. Matches original performance flow and is available as a complete ready-to-install unit that's fitted with valves and springs.

CARB Notice

Legal in California, or other states adopting California emissions standards, only for racing vehicles that may never be used, registered or licensed for use, upon a highway. Can not be shipped to California residents.

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Details

These are the only NEW Jeep® cylinder heads (NOT rebuilt), available in the aftermarket today. Built with all new parts, these cylinder heads have been engineered to withstand the demands of aggressive off-road driving and will resist potential cracking and warping. The Jeep 4.0L and 2.5L heads feature hardened valve seats and heavier than stock castings to increase strength and durability of original equipment. Bare cylinder heads are also available less valves and springs. Gasket sets, pushrods and rocker arms available separately.

Installation Notes

Installation Difficulty:

Level 3Advanced

Installation Time: 6-8 hours

Parts Included

Cylinder Head

Warranty

90 Day Limited Warranty.

Engine Size: 4.0L I-6
Engine Fuel: Gasoline
Shipping Weight: 78lb
Shipping Dimensions: 30in x 6in x 6in (L x W x H)

Jeep Cherokee (XJ)
2001 Jeep Cherokee (XJ)
2000 Jeep Cherokee (XJ)
1999 Jeep Cherokee (XJ)
1998 Jeep Cherokee (XJ)
1997 Jeep Cherokee (XJ)
1996 Jeep Cherokee (XJ)
1995 Jeep Cherokee (XJ)
1994 Jeep Cherokee (XJ)
1993 Jeep Cherokee (XJ)
1992 Jeep Cherokee (XJ)
1991 Jeep Cherokee (XJ)

Jeep Grand Cherokee (WJ)
2004 Jeep Grand Cherokee (WJ)
2003 Jeep Grand Cherokee (WJ)
2002 Jeep Grand Cherokee (WJ)
2001 Jeep Grand Cherokee (WJ)
2000 Jeep Grand Cherokee (WJ)
1999 Jeep Grand Cherokee (WJ)

Jeep Grand Cherokee (ZJ)
1998 Jeep Grand Cherokee (ZJ)
1997 Jeep Grand Cherokee (ZJ)
1996 Jeep Grand Cherokee (ZJ)
1995 Jeep Grand Cherokee (ZJ)
1994 Jeep Grand Cherokee (ZJ)
1993 Jeep Grand Cherokee (ZJ)

Jeep Wrangler (TJ)
2006 Jeep Wrangler (TJ)
2005 Jeep Wrangler (TJ)
2004 Jeep Wrangler (TJ)
2003 Jeep Wrangler (TJ)
2002 Jeep Wrangler (TJ)
2001 Jeep Wrangler (TJ)
2000 Jeep Wrangler (TJ)
1999 Jeep Wrangler (TJ)
1998 Jeep Wrangler (TJ)
1997 Jeep Wrangler (TJ)

Jeep Wrangler (YJ)
1995 Jeep Wrangler (YJ)
1994 Jeep Wrangler (YJ)
1993 Jeep Wrangler (YJ)
1992 Jeep Wrangler (YJ)
1991 Jeep Wrangler (YJ)

Jeep Wrangler Unlimited (LJ)
2006 Jeep Wrangler Unlimited (LJ)
2005 Jeep Wrangler Unlimited (LJ)
2004 Jeep Wrangler Unlimited (LJ)

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Review Summary

Based on 12 reviews

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Questions

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ProMaxx Performance Products ProMaxx Performance Cylinder Head with Valvetrain Reviews

ERNEST V.

4/27/2022

Running great

John M.

7/21/2021

Great product!

Harold C.

4/13/2021

I have been running this head in my 2001 XJ for a year now. I was a great replacement over the tired original that came with my Jeep. Coolant flow is better, improved horsepower, smooth drivetrain. I definitely would recommend this upgrade if you are still running your stock heads. Temps have not exceeded 217 degrees, even in the hottest days of North Carolina.