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1 inch carb spacer

5K views 6 replies 7 participants last post by  adryan16 
#1 ·
I put a 1 inch carb spacer on tonight. The main reason is to help disapate the heat from the manifold to the carb. The car seems to run fine with the spacer. But I noticed it seem as though it might have lost a little of the bottom end when cruising. When I stomp on it from a light it seems great. I have read a lot of the articles on carb spacers. I would like some feedback on people who recently installed a carb spacer on a small block chevy with 600 Edlebrock Carb. What was your experience......??? Thanks.....
 
#3 ·
I agree with 68nova.

I used a 2" spacer on my engine . It was a four hole spacer . I connected the two holes on each side ,so now it still has a divider in the center but is oppened up on each side for better breating. It seems to work pretty good. I got the idea from shoping for spacers. I came across some pretty expensive spacers that had this design.
 
#5 ·
Do you have a dual plane manifold, or a single plane? I have a nova w/ a 350, and when I had a dual plane Weiand, I put an open spacer, and noticed that it just didn't perform the same. Did some studying and found that for best results, you should use the four hole spacers on a dual plane, not an open spacer; you use those on single planes. Hope that helps a bit.
 
#6 ·
Hello black66,

I have a dual plane manifold and a Holly 600 cfm. I just installed an open spacer and noticed that the mixture leaned out and I lost some low end snap. I changed it out with a 4 hole. The snap is back and the mixture is almost back to normal.

With the open spacer, I was going to have to go up a jet size or two. The 4 hole seems to have a stronger signal at low RPM and I just adjusted the idle mixture.

Tom
 
#7 ·
I'll try to explain this a good as I can, but if you had a 4 hole spacer on a dual plane manifold, and you wanted to divide the spacer into 2 ovals instead (maching out two of the walls of the spacer) , would you divide it so that the primaries and secondaries are separated, or so that theres one primary and secondary on each side?
 
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