Quote:

Quote:

i run evac system and thats all.



Make sure the evac is working. If it is the header/pipe smog valve type the smog/back-fire valves do not last long. Once the disc falls off inside the valve you could be pressurizing the crankcase.
I gave up on this type of evac and just left the hoses off.



If you dont run exhaust you dont even need the valve
but at low rpm is when the valve helps.. I've run the
valve 8" away from the point where the pipe attached
the collector just to keep it farther away from the heat
and its all about the angle of the end of the pipe
and where its located in the collector for the best vac