[gtofreek]

The man I work for, Jeff Koerner, grinds the 1", four hole phenolic spacers a certain way that the Super Sucker and others started copying. He started doing this years ago when he worked with Norm Schenk from Compitition Fuel Systems. They gained 10 HP on a SB Chevy with the first one they did. He ground one for a customers dominator he built and it picked up the flow on the dominator from 1215 cfm to 1341 cfm! 126 cfm with just a specially ground spacer. It gets rid of the dead air space directly below the throttle plates. The extra 126 cfm's of flow may not make any more HP though if the engine doesn't need the extra flow. In this particular case the engine only needed 900 cfm so the spacer didn't really make any more power since the carb itself was more than enough for the engine by itself. We tested another CNC cut tapered spacer[I think it was a Wilson spacer] with a 950 HP Holley and it picked up 43 cfm. Jeff's 4150 spacer on the same carb. picked it up 75 CFM. He's really good at grinding the spacers. They help more so on undercarbureted engines than engines with enough carb. They always help with fuel distribution though.