what's the concensus on going to a bigger valve head as far as af's ? does simply adding a bigger valve head mean the ecu won't compensate for the extra air and add fuel? time for a cheap stand alone af meter eh? i'm running giac now with a 15% ; but have added a webb head from a brother here who has found jesus . the giac was on the rich side . so ..... will adding a head be too much for the ecu to make up for ?