Re: intake carb spacer ?
In 2013 we spent all day with my 427 on an engine dyno. At that time it was 13.8:1 compression on race gas with an old set of AFR 210 heads. I had a 1" open spacer on it with a Dart single plane manifold that was port matched to the AFR heads. After tuning it for peak power with that setup we tried a variety of different spacers and combinations of spacers. Several of them were of the super sucker design. We only saw a slight power increase with taller open spacers. The 4 hole spacers made less power. This was on a 640HP small block.
'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter