• Pontiac Engine Firing Order

    Pontiac V8

    265, 301, 307*, 326, 350, 389, 400, 421, 428, 455

    Firing Order

    Cylinder Numbering Distributor Rotation

    Rotor Under Cap Spins:



    (*307 rotates Clockwise)

    These graphics courtesy of

  • How to Set Valve Lash How to Set Valve Lash
  • HotRod Magazine's article on "What Causes Passenger Side Lifter Clatter on Pontiac V8 Engines"

    HotRod Magazine's article on "What Causes Passenger Side Lifter Clatter on Pontiac V8 Engines"

    Click Image to enlarge

  • D-Port vs. Round Port Edelbrock Performer RPM Heads D-Port vs. Round Port Edelbrock Performer RPM Heads
  • Compression Calculator Compression Calculator Simply fill in the form to calculate your compression ratio
  • Car Craft - Pontiac 400-455 Block Car Craft - Pontiac 400-455 Block    Car Craft 400-455 block.pdf
  • Camshaft Selection

    Not sure what cam is right for you?
    Simply fill out this CAM form and submit it to us. Our engine techs will review the information and give you a recommended cam for you application.

  • Torque Convertor Selection    convertor.pdf

    Not sure what convertor you need?
    Download our convertor recommendation sheet, then fill it out and fax or email the sheet to us. We will call you back with our recommendation.

  • Preassembly Tip Sheet

    Click HERE for this instruction sheet.

  • Pontiac Oiling System Diagram Pontiac Oiling System Diagram    OilRestrictors.pdf

    Click here for the diagram

    Download PDF to determine if you need Oil Restrictors

  • Hydraulic Flat Tappet Lifters    PontLifters.pdf

    Not sure if you have true Pontiac style lifters?

    Download PDF to see difference between Pontiac and Chevy Lifters

  • Butler Performance Inc. Engine Limited Warranty    Warranty.pdf
  • Camshaft Degree Instructions    145.pdf
  • Valve Adjustment    VALASH.pdf
  • Pushrod Length Checking Instructions Link to article on
  • Head Torque Sequence Diagram Head Torque Sequence Diagram

    Click here for this instruction sheet

  • Pontiac and Olds Shaker Unit Interchangeability

    To use a shaker scoop from an Oldsmobile engine you will need to locate another shaker from a pontiac application. (See pictures to identify) The bottom portion of the shaker unit is metal and is riveted to the fiberglass shaker. The Olds and Pontiac fiberglass portion of the unit is the same. The rivets will need to be drilled and the metal portion removed to be attached to the corresponding application.

    Oldsmobile Shaker

    Pontiac Shaker

  • Water Pump Height Diagram    pONTIACWaterpumpdiagram_2.pdf
  • Overheating? - Try our check list

    Cooling has long been an issue in performance enhanced gasoline combustion engines. We recommend engine temperatures not in excess of 180 degrees (F). The cooling system in your pontiac engine is very simple consisting of only a pump, thermostat, fan, and radiator. Failure of only one of the components in the cooling system will result in excessive engine temperatures. Excessive engine temperature can damage an engine in mere seconds. Since different metals expand at different rates with increased temperature you can be sure that engine component clearances are altered, causing wear or premature failure. The most harmful effect of high engine temperature is detonation. Detonation for even a short period of time could damage your rod bearings or possibly even puncture the top of a piston. When attempting to resolve an issue with the cooling system one might start with a checklist covering these subjects:

    • Is there a sufficient amount of coolant in the cooling system?
    • Is the thermostat stuck?
    • Is the radiator clogged? (Inside and out)
    • Is the radiator sufficient for the application?
    • Is there a fan shroud on the radiator?
    • Is the fan close enough to the fan shroud?
    • If the engine is freshly built were the proper gaskets used? (head & intake)
    • If the engine is 1969 or later are the plate and sleeves installed in the timing cover?
    • If the engine is 1969 or later are there good o-rings in the sleeves inserted in the timing cover?
    • If the engine is pre 1969 are both plates installed behind the water pump?
    • Is the impeller of the pump as close as possible to the plate behind it?
    • Is the air/fuel mixture of the engine too lean?
  • Smog-Era heads to OEM intakes modification    HPPP-130100-RO.pdf

    How to modify a smog-era Pontiac cylinder head to accept any original intake manifold

  • Blocks and Motor Mounts - What will fit my car Blocks and Motor Mounts - What will fit my car

    Click Here for information

  • 4.25 or 4.500 crank clearance

    This picture shows the only area that normally needs to be clearanced to put either a 4.25" or 4.500" stroke crank in a Pontiac 400 block- although any new part should be installed and all clearances checked prior to final assembly because of factory production variances.