Holley stubstack

Taller is better with filters, as long as you have hood clearance. But if you're trying the K&N Filter lid that is also a filter, do some careful testing. I don't know if it changed the clearance above the vents and/or if it had something to do with the pleated filter which caused the air to pass through the filter top in many directions (turbulence) so close to the carb entry, but the standard solid metal air cleaner top worked better than the filter top! (14" x 3.5" filter with a drop base.) I didn't get around to checking if jetting was a factor in this case. It was faster, I was happy and left it alone.