Intake / Exhaust

  • PAC 1218 Valve Spring Set

    This USA made beehive spring has a higher seat pressure than the Comp 26915 but with the same spring rate.  Drop in replacement for 3100, 3400, and 3500 engines, with a 1.700" Install height  Drop in with matching retainers for the Gen 2 2.8/3.1 Aluminium head engines, using the same stock 1.700" …

    $154.99

  • LX5 Throttle Body Package

    A complete kit to install a 65mm LX5 Throttle Body onto a 3100, 3400, or 3500 60V6 engine.  2 kits are available, one for the 3100/3400 upper intake, and another that is for the 3500 intake.  The 3500 version is considered universal, since it bolts the bracket to the throttle body and not the mani…

    $199.99

  • LX5 65mm Throttle Body

    Upgrade to a 65mm throttle body for better throttle response and more power.  We clean, blast, and inspect every throttle body we sell.  Can be used on the 3100, 3400, and 3500 upper intake with our WOT-Tech LX5 TB Adapter.  A modified cable bracket is also available for the 3400 or 3500 upper in…

    $99.99

  • Cable Bracket for LX5 TB

    We offer 2 types of cable brackets, one for 3400 style upper intake manifolds only, and another universal that works with the 3500 manifold.  There is an article demonstrating how they are made if you want to check that out. These brackets are designed to make installing your 65mm LX5 throttle b…

    $39.99

  • LX5 65mm TB Adapter

    We have designed an adapter to use the 65mm TB found on the Oldsmobile 3.5 DOHC. Bolting it to the manifold (3100, 3400 or 3500, both bolt patterns and sets of bolts are included) is no problem, but attaching the throttle cable bracket will be a DIY project.  You will need both gaskets for the 3400…

    $54.99

  • Stage 1 3500 Upper Intake (2004-2006)

    Each upper intake is cleaned, baked, blasted, and inspected for cracks and warpage.  This version of the 3500 upper is designed for replacing a 3400 upper intake, using the 3400 intake gasket size for the gasket match.  Flow is improved further by reshaping the entrance of the port internally beyo…

    $99.99

  • Stage 2 3500 Upper Intake (2004-2006)

    Each upper intake is cleaned, baked, blasted, and inspected for cracks and warpage.  This version of the 3500 upper is designed for 3500 engines with its larger upper intake gasket.  Flow is improved further by reshaping the entrance of the port internally beyond the factory design.    …

    $124.99

  • Stage 1 3500 Lower Intake (2004-2006)

    Each upper intake is cleaned, baked, blasted, and inspected for cracks and warpage.  Our Stage 1 manifold is geared towards use with a 3400 upper intake.  This is common for 3500 top end swaps on 3400s and 3500 swaps where the 3500 upper does not fit.  Gasket matched and blended with modification…

    $124.99

  • Stage 2 3500 Lower Intake (2004-2006)

    Each upper intake is cleaned, baked, blasted, and inspected for cracks and warpage.  Our Stage 2 manifold is the best flowing lower intake and works best with our Stage 2 3500 upper intake.  Gasket matched and fully ported based on our flowbench testing.      

    $174.99

  • ARP Header Studs

    Headers can represent a sizable investment, so you'll want to keep them securely attached. In addition, exhaust leaks can cost you power and even cause damage to your vehicle. ARP has the answer, in the form of their stainless steel header studs. They're made from premium 300 stainless steel…

    $139.99

  • ARP M8 x 1.25 Thread Chaser

    A thread chaser will clean out threaded holes without removing material.  We use these on our blocks and heads before assembly to create the ideal clamping force from consistent torque measurements. 

    $34.99

  • ARP M10 x 1.50 Thread Chaser

    A thread chaser will clean out threaded holes without removing material.  We use these on our blocks and heads before assembly to create the ideal clamping force from consistent torque measurements. 

    $49.99

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