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timken front axle, nh220 heads
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By stevescheel - Monday, October 18, 2010 6:59 AM
I'm restoring a 1948 Kenworth and am looking for a steering kit that I believe is Rockwell kit #112.   Axle appears to be original Timken with 30 1/2" spring centers.  Kingpins are 9.25" X 1.484".

My engine is a 220 that was converted to a 262.  I'm restoring it to the original 220 and my Cummins manual states there are 1/8" vent holes in the intake side of the heads that need to be opened for naturally aspirated engines and plugged if a turbo charger is used.  My heads do not have the vent holes and there are no matching holes in either the new gaskets or the rocker boxes.  The internal casting design on one of the heads is different than the other two also so with my lack of experience I have no idea what kind of alterations the engine might have gone through.  Can anyone tell me about the phantom vent holes?
By Rick/mn - Monday, October 18, 2010 7:45 AM
I kind of forgot about those holes - plugged quite a few of them -probably about 40 years ago. Boost from the turbo would fill up the crankcase if not plugged but I doubt there would be any problem using the heads the way they are for natural breathing. And if you felt the need a small hole could be drilled thru the top of that intake passage, but then if your gaskets and upper rocker boxes don't have corresponding passages -? Hardly seems worth worrying about
By glenn akers - Monday, October 18, 2010 3:27 PM
I dont remenber about a 220 and can not see in my mine the plugs but a 855 block did have. I have turboed some 220 but can not remenber the plugs. But for as taking the turbo off i would not worry about the venting.