I will be getting to the upper engine work momentarily, and I was wondering if I should use a spacer with my combo. My combo is a Holly 4150 750 cfm, Performer air gap intake, with an XE274 cam. The AFR 195s are flowing about 265 cfm. Would I realize any HP gains with a spacer? And if so, what thickness should I use, and 4 hole or open? I think my combo is designed for low end to mid-range torque. As always, TIA. Kevin

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We will either find the way, or make one. Hannibal

68 Chevelle
383 Stroker/AFR 195s/XE 274/RPM Air Gap/Holley 750 cfm

TC# 1805

If you have room, and you want to experiment a little, the four hole spacer will be better for drivability, and low speed torque. I had to use a spacer with my double pumper because the rear accel. pump would hit the vacuum fitting on my Performer RPM, but it's not the air gap. I tried both types, and they both work well, but the open spacer hurt the bottom end and idle quality a little.

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Steve B.

Look on the bright side, things are better now than they will be tomorrow.

69 Malibu ZZ4-350
88 Camaro Sport Coupe
93 Camaro Z/28
01 Silverado LT Z/71
Chevelle pics (http://hometown.aol.com/zz69chevelle/myhomepageauto2.html)