For automatic transmissions take a vacuum reading in gear at idle and if the vacuum is below 12" divide that in half for proper size.
Whatsize power valve stock 1850 holley how to#
How to tell what size power valve you need: To properly size a power valve, take a vacuum reading at idle and if it is above 12" for a standard transmission a 6.5" will be safe to use. 
You can also do this adjustment without a vacuum gauge, the adjustment are the same except you will adjust to highest engine RPM at idle.
While at idle, back them out 1/8 turn at a time, alternating between the 2 or 4, until highest vacuum is achieved. Next, back them out 1 full turn and restart the engine making sure the choke is completely off. Turn the screws all the way in until lightly seated. Install a vacuum gauge to a full manifold vacuum port. How to adjust the mixture screws on your carburetor: To set idle mixture screws perform the following steps:. carb, a standard transmission can use a Double Pumper carb. If you have an automatic transmission you will need a vacuum sec. How to tell what size carb you need: You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. K1 RaceGear Custom SFI 5 Nomex® Auto Racing Suit - $1399.95.
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