well I'm no perfect engine tuner but I'm learning. I Have a 665 H/p 434 sbc in a 85 camaro that runs 6.20 @112mph in the 1/8 - I have a Dart intake with a 950 ultra hp Holley, I put a 1'' 4 hole wood spacer no change, I put a open 1'' wood spacer no change, I put a HVH 4 hole super sucker no change, it still runs the same no better no worse, is there anyone that could tell me how much larger jets should go with the spacers, my timing is @ 38 degrees and I've pretty much kept it there.
Andy