Originally Posted by hotrodf1
Did you say you had a white spring in there? I could be mistaken but I thought the two lightest springs in the HOlley spring kit were Yellow (Short) and yellow (long).
Also I looked on the package and they show values for opening and fully open based on the displacment of engine. On a 400 CI engine, with the lightest spring, you still don't open all the way until over 5000 RPM.
So a vac. sec. will never be like a mech. sec. carb in my opinion. But I run a vac. sec. in my camaro and my 48 PU and I think they work quite well so i stick with em.
I would assume that with a 502 it would be fully open at a much lower RPM
with a lighter spring
What's weird here is that the 20-13 Kit comes with a White spring. But The instruction sheet that's in the box says nothing about it ..Not listed.
Now go out to Holly.com Here's the link..
And look on page 2 of the PDF.. and you'll see the white spring listed as the lightest.
If the link does not work go to holley.com and punch in 20-13 and it will come up .then look for the instruction sheet.
There isn't a spec shown for the opening RPM or the Full Open RPM. FREAKEN Neat huh..... That's why I'm not a big Fan of Holley Carbs. But I'm stuck with this sucker as it is flowed for this motor. And I'm to lazzy to start pulling stuff off and on.
I guess I just want An "Easy" Button to Push.