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If you've got hollow breather bolts in the heads, you want the open one.
If you are early 93 and have a case breather with solid breather bolts, you want the bottom one.
The breather bolts you're referring to are the ones on the head that are attached to the back of the air cleaner by short flexible tubes, correct? If so, mne are indeed hollow.
If it was an early 93 (which apparently my isn't), those bolts were solid? So the rocker box oil mist wasn't allowed to vent anywhere?
The breather bolts you're referring to are the ones on the head that are attached to the back of the air cleaner by short flexible tubes, correct? If so, mne are indeed hollow.
If it was an early 93 (which apparently my isn't), those bolts were solid? So the rocker box oil mist wasn't allowed to vent anywhere?
The breathers allow the engine internals to vent, regardless of where they are located! Twice as much air circulates through the engine internals than the cylinders take in through the inlet valves.
The breather bolts you're referring to are the ones on the head that are attached to the back of the air cleaner by short flexible tubes, correct? If so, mne are indeed hollow.
If it was an early 93 (which apparently my isn't), those bolts were solid? So the rocker box oil mist wasn't allowed to vent anywhere?
Basically. Shovels and early evo's didn't breath through the heads.
92 was supposed to be the last of the bottom breathers, but it's a head bolt and lower case thing.
The gasket with the square in the bottom, is a bottom breather evo and shovelhead gasket.
The breathers allow the engine internals to vent, regardless of where they are located! Twice as much air circulates through the engine internals than the cylinders take in through the inlet valves.
So on the early 93 EVOs, where was the vent to atmosphere?
If it was an early 93 (which apparently my isn't), those bolts were solid? So the rocker box oil mist wasn't allowed to vent anywhere?
The breather system on the `92 and earlier engines is a crankcase breather, there is a nipple at the rear of the case, just inboard of the oil pump for the breather hose, the hose would have originally been routed to the air filter backing plate on models made since the early `80s.
So, with the top breather gasket in place, everything lines up except this one hole. If I'm not mistaken, that hole mates with an oil gallery in the nose cone that feeds oil to pinion shaft. By the way, the bottom breather gasket, lines up perfectly here.
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