Originally Posted by 84Caprice57
Let me just say - I've never seen something so simple make a huge difference. I switched to a Wilson 4 hole tapered spacer. I was a little leary about dropping 125 on something so simple - but WOW. Everything I read says use open spacers on single plane intakes, and for dual planes, use a 4 hole or 4 hole tapered. But wow... This was truly glorious.
I read up on these and I'm ready to risk the $$ to try it, even at the expense of another inch of my precious air cleaner element height
Wilson does say that the one case where they don't help is with a high-overlap engine with reversion. I have a lot of overlap, no idea about reversion, but I'll give it a shot anyway. Wilson says try using a 'combo' spacer (or you could make one... essentially it's a 4-hole changing abruptly to a full-open) if reversion exists.