nick6690

what is the difference between AFR's emission and non emissions legal heads.

nitrous_bob

look at the valve sizes.... smog legal will be 1.9/1.6

the non legal will 2.02/whatever

nick6690

this is probly a stupid question but is there any way i could pass emissions with the non legal heads?

FullAuto

Depending where you lived and the requirements, yes.

WhiteFoxGT

the emissions heads also have the thermactor ports thru the exhaust also

nitrous_bob

passing the sniffer is not the problem, if you have a visual, you can get popped for not having a CARB number on them

not every smog tech will catch it...but if they do you have issues

i passed a sniffer in cali w/ long tubes, no smog pump and no cats

but obviously it would pass the viz

mjr46

^^^^^^that's not true!! I have afr 185's that are emissions leagal with the thermactor plugs installed at the rear of the heads and the exhaust crossover on the intake side ...which I have blocked off.. I got emissions heads just incase I ever had to go through emissions..but live in a state where we don't have it..and mine are 2.02/1.60 valves...they make them both ways

nick6690

is there any performance difference between the two? and what is a thermactor port?

mjr46

not really...thermactor ports are at the back of the head that are hole by which air is injected into the exhaust ports which mixes with the exhaust gases and inturn the reaction that occurs heats the cats up quicker to reduce emissions on initial cold start ups

nick6690

thanks for the help guys. i think im gonna risk it and get the non legal ones, that is, whenever i can get a damn car.