Spacers on a single plane intake

[dodge freak 2]

Whats the pros and cons on spacers on a open single plane intake ?

Seems like I just hear about using them on a dual plane intake to increase rpms.

I am using a holley non egr street dominator intake on a SB and its fairly low, I have some room for a 1/2" maybe a 1" spacer. What is the thinking about what happens. Seems to me by raising the carb, it slow the flow down. That be no good right ? I believe 4 hole spacers are to help the low end but it seems fine. I am thinking of an open spacer.

[MEK-Dangerfield]

The one nice goodie about a spacer is it's a plus at preventing vapor lock since you raise the carb off the hot intake. 

I would stay with an open spacer. I have the same intake on my big-block. It didn't run as well with the 4-hole spacer(I experimented  ).


  Mike

[Chryco Psycho]

an open spacer will increase the plenum volume which will generally help with mid to high rpm power , why not try it

[cudabob496]

In my opinion, generally only a benefit in high rpm engines, but many times they can hurt perfromance as well as improve it. Just got to experiment. I did however machine my single plane down a bit to use a spacer to keep the carb cool, while still having enough hood clearance.

[Chryco Psycho]

The SD is a relatively small plenum intake which is great for hood clearance so adding plenum on the SD should help but not always

[cudabob496]

Seems like in your case it could help. Will keep carb cooler, and will increase plenum volume to provide more top end power. Raising the carb should increase flow I would think, and make the flow more laminar (thus the power increase at high rpm). All depends at what rpm we want to make power.