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  1. #1
    "Hustler" Inkaddict's Avatar
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    Reusing 4 Tech Bolts?

    I know that their "yield to spec" bolts for the head, fly wheel, main and rod bearings but how many people do/dont replace them? We've "reused" 1 time only bolts on cars pushing boost upwards of 50 pounds with no problems. Im new to the 4 tech platform and have had some friends tell me I absolutely have to change the bolts durring rebuild. Can some of the hard hitting 4 Tech guys WITH EXPIERIENCE rebuilding these motors help a brother out... Thanks

    TJ


  2. #2
    Quote Originally Posted by Inkaddict View Post
    I know that their "yield to spec" bolts for the head, fly wheel, main and rod bearings but how many people do/dont replace them? We've "reused" 1 time only bolts on cars pushing boost upwards of 50 pounds with no problems. Im new to the 4 tech platform and have had some friends tell me I absolutely have to change the bolts durring rebuild. Can some of the hard hitting 4 Tech guys WITH EXPIERIENCE rebuilding these motors help a brother out... Thanks

    TJ
    Since they are stretch bolts, it certainly isn't the greatest idea to reuse them. If you want reusable hardware, the flywheel bolts and the head studs are made by ARP, which I keep in stock. With those two replaced with ARP the only ones you'll have to replace would be rod and crankcase bolts.

    - Armin

  3. #3
    Moderator beerdart's Avatar
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    CAUTION: This assembly uses stretch screws.
    As the screws have been stretched from the
    previous installation, it is very important to
    measure each screw at assembly. If screw is
    out of specification, replace by a new. Failure
    to replace screws and to strictly follow the
    torque procedure may cause screws to loosen
    and lead to engine damage.
    CYLINDER SCREW M11
    SERVICE LIMIT 148.5 mm (5.846 in)

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