HeadBolts.com engine hardware store

We have cylinder head bolts (as well as all types of engine fasteners) for gas and diesel engines.

Automotive, truck, and inboard marine applications.

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  • Browse our aisles by going to categories menu, For all the engine hardware needs. We have bolts for your car ,truck or marine inboard engine

Price: $72.99
Availability: Out of Stock

    L6 4.2 liter (258) jeep 7/16 thread bolts 7 long 4.5 uhl 7 short 3.750 arp bolts

    arp cylinder head washers please check thread sizes before ordering these do not have studs on top that may be needed for valve cover / accessory's for example casting numbers 89330000 we have found that in some cases model 4.2 may use the 1/2 thread bolts

    torque is 70 foot pounds done in three steps 30 55 then 70 ft pounds with arp lube included in kit. Cylinder head washer goes inner chamfer side up ARP High Performance Series bolts are cold forged to ensure molecular integrity, heat
    treated prior to thread rolling and machining and nominally rated at 180,000 psi tensile
    strength. Optimum design, enhanced reliability and increased strength are the main attributes
    of ARP’s High Performance Series fasteners.

    # 146-3603

    more 258 head bolts

    Number of questions: 2
    my book (and all the web sites show this) shows 3 step t0 110 ft lbs and because it is in a water jacket l/s front headbolt 3 step to 100 ft lbs with sealer . If I use your head bolts will the 70 lbs be correct for 1984 jeep 4.2 258 engine ?
    bdogwm May 25, 2022 11:25 AM
    yes a 84 with 1/2 threaded bolts would be 100 ft pounds but if you have a block that has 7/16 threaded bolt like these or the oem 7/16 bolts the torq is 70
    admin63484 May 25, 2022 11:45 AM
    Do you carry the double ended cyl head bolts?
    thundley December 2, 2016 6:22 PM
    sorry we do not have them
    admin63484 December 3, 2016 8:09 AM

    Providing cylinder head bolts / engine fasteners to engine rebuilders  since 1988

    HeadBolts.com 20 mirona rd ext Portsmouth NH 03801

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