Building a Blow Through Carburetor For The Turbo 460 Part 1

This is the first of our series on building a blow through carb using a regular Holley 750cfm mechanical secondary. I did a terrible job filming this but the I will summarize and provide affiliate links to the parts. To make a carb work with low boost is pretty easy. start by removing the choke and epoxying the hole in the main body closed where the choke rod came through. Remove the main body from the throttle plate, nock the power valve check valve out of the throttle plate then drill tap and plug it. If you have brass floats replace them with nitrophyl floats. Remove the primary power valve, drill the power valve channel restrictors to 0.080" and install a boost actuated power valve. If you have a secondary power valve plug it.
Boost actuated power valve amzn.to/3DesNHA
Front nitrophyl float amzn.to/3xG0roK
Rear nitrophyl float with jet extensions amzn.to/3rq8ZyJ
Epoxy amzn.to/3d4HR05
Popsicle sticks to mix the epoxy amzn.to/2ZG6QDE
Pin vise and small drills amzn.to/3G3yuKl This is garbage but it gives you an idea of whats needed. I will be changing this in the third video of building a blow through carb when i turn the boost up.

[@courier11sec]

Wait a sec don't most folks use the power valve circuit to actuate the power valve? Fuel pressure to actuate a power valve? Unique approach..

[@stevenbelue5496]

So you blocked your power valve signal ? Is it working that way?

[@koalafiedengineering1200]

Yes, The boost actuated power valve opens based on fuel pressure in the bowl. As boost builds fuel pressure is increased 1:1 with the a fuel pressure regulator. There is a screw that sets tension on a check ball via a spring. as you increase spring pressure by tightening the screw in the power valve you delay boost fuel enrichment.

[@rwwisehart]

How many bolts hold on the carb bowl did you say prick