Quote:
Originally Posted by reddog565
What do you guys think about adding the road
Draft tube, I have it blocked off..
|
That would be a step backward! Those road draft tubes only worked at highway speeds, and not too effectively then. Around town. speeds were too slow to generate any draft at the road tube. One reason why so many Y-blocks sludged up and starved the rocker arms.
Try this: With the engine idling, lay a piece of cellophane over the fill tube. There should be enough vacuum build up after a few seconds to pull the cellophane into the tube. If not, check the PCV valve for proper flow. Some valves threaded into the carb/intake, so the flow was from the barbed (or hose) end into the intake. Other similar looking PCV valves threaded into the block/valve cover so the flow was from the threaded end, out through the hose and on to the intake. The internal check valve will block flow if the PCV valve is backwards.
You could make/adapt an oil fill cap with a hose running to the air cleaner to reburn the blowby, like OEM PCV systems do.