do undr drive pulleys affect emisssions? I;m thinking they could since they slow down the engine accessories about 25%......the smog pump may not be putting as much air out turning slower. Should I pput the stock pulleys on for emissions?

 

I seriously doubt it will effect emissions any noticeable amount. I can pass the LG4 test with a small block 400, and im pretty sure my cat is not working. That should tell you how much of a margin there is.

------------------
1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
Clarion 45X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
"A four cylinder is only half an engine"

 

I wouldn't worry about it.

------------------
ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

R.I.P. #3
My favorite quote about D.E. "He can see air"