Quote:
Originally Posted by GregWeld
Jody -- Where's the breather on these motors??
Seems to me - just like in an old skool motor - that there needs to be somewhere for filtered fresh air to enter the crankcase (old skool would be the valve cover the opposite side of the PCV).
I get that the LS motors don't run that old skool breather in the V/C but there has to be make up air from somewhere???
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I'm not sure on all LS, but the majority have the top block plate under the intake with a baffled nipple fitting, and a hose that runs from there to the vacuum port of the throttle body. On the valve cover there is another nipple that runs to the inlet tube between the throttle body and the maf, or directly to the throttle body to a non-vacuum port in front of the throttle blade. That is where the engine pulls the air into the system, and air from there is already filtered by the air filter and metered by the maf, and accounted for. You could also run the tube from the valve cover to the air filter box, or just have a K&N filter on the end of the hose, but now you're putting un-metered air into the system if you still have the maf. Not a big issue though (other than smog legality), but it does change the tune somewhat, and should be re-tuned for it. If it's running speed density (no maf) it's not an issue.