Headed to the Dyno for the first time!

Discussion in 'Street/strip 400/430/455' started by 71rivera, Jul 31, 2020 at 11:22 PM.

  1. 71rivera

    71rivera Platinum Level Contributor

    Any suggestions on what to do to prepare for a trip to the engine dyno?
    I fired it up on the test stand to check for leaks....
    Do I need motor mounts installed or do they bolt to the block?
    I assume they have an assortment of fittings etc. For fuel connections, oil psi and water temp?
    Looking to be as prepared as possible.
  2. No Lift

    No Lift Platinum Level Contributor

    Do they have headers for the Buick or are you supplying them?
  3. 73 Stage-1

    73 Stage-1 Dave

    +1 on the headers... as for the rest, it'll be worth asking the shop as each one is different.

    When I dyno'ed my 460 Ford I had to source headers, as the ones I have in the car wouldn't fit around their dyno (they cross over under the oil pan), and the shop didn't have anything close in size and length. The dyno had a MSD ignition system we hooked to my distributor and lines for the carb and oil pressure. Water temp was done through their cooling system.

    Good luck!
  4. Stevem

    Stevem Well-Known Member

    If you have done a bunch of power up grades on the build I would bring along a set of one step colder plugs then what you broke the motor in on and in terms of Headers you for sure want to dyno the motor with the ones you will run in the car if they clear the dyno.

    I have seen a 20 hp drop from the dyno headers the motor was tested with and the ones the car had to run!
    This is enough of a difference especially when the motor was home and breathing thru the cars full Exh system to have it run too fat above 4000 rpm at full throttle as seen by O2 sensors fitted in the headers the car was running.
  5. Golden Oldie 65

    Golden Oldie 65 Well-Known Member

    Weld a bung for the O2 sensor in the collector of one of your headers.
  6. 71rivera

    71rivera Platinum Level Contributor

    I do have a set of headers that I will be running in the car.
    Is there a certain spot in the collector that the bung should be welded?
    Is there any benefit to putting one in both sides?
    Thanks a lot guys, I appreciate the advice!
  7. 71rivera

    71rivera Platinum Level Contributor

    Also curious, what is the thought behind having the cooler plugs along?
    I will pick up a set. Thanks!
  8. Stevem

    Stevem Well-Known Member

    IMG_0182.JPG IMG_0183.JPG IMG_0182.JPG IMG_0183.JPG IMG_0184.JPG Info on plug heat range.
    70 GMuscle likes this.
  9. 71rivera

    71rivera Platinum Level Contributor

    Wow! lots of info there. Thanks
    70 GMuscle likes this.
  10. Scrappy

    Scrappy Well-Known Member

    Best to call the 'dyno guy' and ask what you'll need. May need a starter, and some dyno's use their own starter, do you require a manual flywheel? Headers, motor mounts. Maybe spare header gaskets. Make sure thermostat is not installed! Do you have electric water pump? If not, will need to loop a belt from water pump to crank, unless of course the alternator and bracket will be used.

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