Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Holley 850 CFM Vacuum Secondaries.. PITA..!!
View Single Post
  #13 (permalink)  
Old 04-12-2006, 02:23 PM
Viet Nam Vette's Avatar
Viet Nam Vette Viet Nam Vette is offline
Last photo:
Join Date: Feb 2005
Location: Egg Harbor Tonwship NJ
Age: 73
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
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 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 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.
Reply With Quote