Edelbrock Jeep 4.0L I-6 E-Series Head Bolt Kit

190,000 PSI Chromoly Head Bolts Built for the Jeep 4.0L Inline Six

The Edelbrock 85332 E-Series Cylinder Head Bolt Kit delivers precision-engineered chromoly fasteners purpose-built for Jeep 4.0L inline six-cylinder engines using 1/2-inch head bolts. Designed to pair directly with Edelbrock cylinder heads 50159 and 50169, this kit provides the clamping strength and thread integrity needed for a proper head installation on the legendary Jeep 4.0L. The 85332 also fits AMC and Jeep 4.2L inline six engines when Edelbrock replacement heads are used.

Key Features

• 190,000 PSI Yield Tensile Strength: Chromoly construction handles high cylinder pressures with reliable clamping force across every bolt position
• Rolled Threads After Heat-Treating: Thread rolling post heat-treatment produces superior form and strength compared to cut threads
• Generous Filleting Throughout: Eliminates stress risers at thread roots for fatigue resistance under thermal cycling
• Small Hex Head Design: Provides extra socket clearance in tight engine bay situations without sacrificing torque capacity
• Black Oxide Finish with Sealer: Corrosion-resistant coating keeps bolts protected during installation and throughout service life
• Edelbrock E Stamped Head: Easy visual identification on every bolt for quality assurance and torque sequencing
• Two-Length Kit: Seven 3.75-inch bolts and seven 4.50-inch bolts cover all head bolt positions on the 4.0L and 4.2L inline six

This Part Fits

Specifications

What's Included

• (7) 3.75-inch chromoly head bolts
• (7) 4.50-inch chromoly head bolts
• Installation documentation

Frequently Asked Questions

The 85332 is designed specifically for use with Edelbrock cylinder heads 50159 and 50169. It may not provide correct thread engagement or clamping geometry with the factory Jeep head. For OEM head applications, use factory replacement fasteners instead.

Yes. The 85332 is compatible with 1987-2001 Jeep Cherokee XJ models equipped with the 4.0L inline six, provided you are installing an Edelbrock 50159 or 50169 cylinder head.

Yes. The 85332 head bolt kit is compatible with 1997-2006 Jeep Wrangler TJ as well as 1991-1996 YJ models, all with the 4.0L I-6 engine when using Edelbrock heads 50159 or 50169.

Yes. It fits 1993-2004 Jeep Grand Cherokee models (ZJ and WJ) equipped with the 4.0L Power Tech inline six when paired with Edelbrock replacement heads.

Follow the torque specifications provided in Edelbrock's installation instructions for the matching head (50159 or 50169). Typical for these assemblies is a multi-step torque sequence. Do not exceed Edelbrock's stated specifications for these bolts.

Threads are rolled after heat-treating, which is the superior method. Rolling forms threads by compressing the material rather than removing it, producing tighter grain structure and greater fatigue resistance compared to cut threads.

The 85332 is a bolt-only kit with 14 chromoly bolts in two lengths. If your application requires washers, source them separately per your head gasket manufacturer's recommendation.

Yes. The 85332 also fits AMC and Jeep 4.2L inline six engines from 1976-1990 when Edelbrock heads 50159 or 50169 are used. The 4.2L shares the same basic block architecture as the 4.0L in terms of head bolt pattern.

Consult Edelbrock's instructions for your specific head. As a general rule, high-strength chromoly head bolts can be reused if they are within proper torque and stretch specifications upon inspection. TTY (torque-to-yield) bolts should never be reused, but these are conventional hex head bolts, so inspection and reuse is possible if the bolt shows no signs of deformation or thread damage.

The 85332 kit includes both lengths to cover all positions on the Jeep 4.0L and 4.2L head. The longer bolts are used in deeper blind hole positions and the shorter bolts in shallower positions. Refer to Edelbrock's installation sheet included with head 50159 or 50169 for the exact bolt-length placement map.

Installation Instructions

1. Clean all head bolt holes in the block with a thread chaser and compressed air to remove debris and oil
2. Inspect each bolt for straightness and thread condition before installation
3. Apply a thin film of engine oil or the sealer specified in Edelbrock's instructions to the threads and underside of each bolt head
4. Install the correct bolt length in each position per Edelbrock's placement diagram
5. Hand-thread all bolts finger-tight before applying torque
6. Torque in the sequence specified by Edelbrock in three stages: initial, intermediate, and final torque values
7. Allow the engine to reach operating temperature, cool to ambient, and re-torque if Edelbrock's instructions specify a hot re-torque step