I have a fresh 383 Stroker, i have about 75 miles on a new engine, the problem is when i drive the car, after the car warms up it blows oil out of the breether about every 15 minutes or so, its a mess it gets all over the engine compartment and worse it end up on exhaust which smokes bad ? Please help if you know the remedy. Thank You Mario

maybe you need a taller breather? are the baffles on the valve covers installed [properly]?

did the rings get properly broken in, or did you fire it up and just start hammering on it?

are you running a pcv valve also, or just a breather? w/o a pcv, it will just blow the positive pressure from the engine out the breather, making a mess.
or, your rings are not sealed properly yet, which after 75 miles would indicate a problem, likely.
or, as was mentioned, if your breather isn't baffled in the valve cover, oil could be saturating your breather, which would explain the quantity you are seeing.

are you running a pcv valve also, or just a breather? w/o a pcv, it will just blow the positive pressure from the engine out the breather, making a mess.
or, your rings are not sealed properly yet, which after 75 miles would indicate a problem, likely.
or, as was mentioned, if your breather isn't baffled in the valve cover, oil could be saturating your breather, which would explain the quantity you are seeing.

That's what I was thinking

Breathers without a PCV puke oil pretty regularly IMO, I prefer to run a PCV on one valve cover and a breather on the other. Even with this setup you will still puke a little oil on the valve cover if you spend a lot of time at WOT (there's no vacuum when at WOT for the PCV valve to work)

Just to re-enforce what was said above. I agree 100%. You need a PCV and a breather (or a breather tank with is what I like to use long with a PCV).

Something I have been doing for years is to cut the toe end off a pair of old or new soxs. Roll it up like a donut, cut to size and place it under the breather. No more leaks on the valve covers. Maybe get lucky and find a color that matches your car. I took a pair of the wifes blue ones. Whats really funny is when she asks where her blue soxs are and you tell her you decorated your engine with them.

I'd do a compression check to make sure you don't have a ring sealing problem. Strokers will puke a bit more than a stock 350 - especially when hammered. After market valve covers may have little or no baffling inside the cover to catch the mist. You might have to put a puke can on it to catch the excess. Ditto on the PCV system.

This is my #1 problem on my car and what is driving me to pull the engine again. I get oil coming out the breather filling the airfiler up with oil as well as oil spitting out the dipstick tube. Its called blow by. What everyone has said sor far is true. Since its a new engine and yor probally installed a new set of rings and pistions did you make sure the rings were installed correctly and not all in a straight line where the gap is?

Ive been going though the process of elimintation with checking compression check, vacum check to make sure the system is presureized. Im still coming up short with answers so Im going to pull the engine and start looking inside her for answers. Of course I'll be adding some new goodies in the process.

Good luck and post up what you find.