Super M breather

dgoodman2

Member
What is this inlet for on the breather?
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If it's like the 450 it has a hose that goes to rocker cover . I think it pulls crankcase vapor back through engine.
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Sounds necessary. Mine wasn't connected to anything. Should I do so. Does the 450 motor have the port at the front. That may be why mine isn't connected.
 
Can't remember, probably part of the crankcase ventilation system. Pipe out of governor to front of head, through pipe under valve cover and out the back of head to the air filter, has an orifice on one end of head, rear maybe?
 
Maybe you have a 450 motor or head, Super M head has a threaded hole in each end with a brass fitting in each hole.
 
I am dealing with about the same thing. Replaced a 8060 {Super M} head with a 450 head and frt. port calls for a pipe instead of the over rocker arm tube. Can anyone tell me what the length of this pipe needs to be and does the valve cover need any additional venting? Never done this exchange before.

Thanks to all.
 
Super M looks like this, think it's a 3/8 pipe with ferrules, not flared and the brass fitting for each end.
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On the 400 and 450 head the front stand pipe is around 2-3/8 long with 1/4 pipe threads on one end. Valve covers for those had a 1/4 pipe thread opening in top, someone pictured on this tread. 45 degree elbow with a orifice hole 9/64 in it. Two different air cleaners were used with one having steel tubing from air cleaner intake pipe to valve cover and the other a hose between fittings on valve cover and air cleaner. In the 400 450 series the steel pipe is found more on earlier production and hose on the 450 end. Doesn't mater about those since using the SM air cleaner. Opening for vent line is located higher on the 400 and 450 intake pipe compared to a SM because of more hood height on a 400 and 450.
 
Ok based on all your comments I know what it's for. I like a vent on the engine. I have a super M with a engine from a 450. It has a LP Gas head. My valve cover doesn't have any holes in it except the two bolt attachment holes. Any suggestions? So I don't have anywhere to hook it up.

Should I make a way to hook it up or let it ride.
 
Check to make sure the hed has no holes in the rear of it, below the gasket of the valve cover. It should be threaded. Jim
 
Production 400 and 450 heads were not drilled for a outside valve cover opening to air cleaner intake as you say. I always vent but some don't. If you can't get a 400 or 450 valve cover a 1/4 inch pipe thread collar can be brazed in the SM valve cover and fitting for a 3/8 hose to air cleaner with a hose fitting there. If you have nothing else take a short piece of 3/8 rod or part of a bolt and drill a 9/64 hole for a restriction and slide it in the hose, 1/2 inch long with hole is enough. Use a 1/4 inch pipe thread nipple cut to 2.25 to 2.375 long in the head front vent hole. Block does have a crankcase vent on the right side.
 

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