MH44 Cam

David G · Oct 2, 2015

Can someone tell me what the cam lift is for the valves on MH44 H260?

Would is a good end play number also?

Thanks.

Dieseltech · Oct 2, 2015

That's the one spec the MH service data book I have does not list. I don't have a cam out right now to check either, do you know what the rocker ratio is?

David G · Oct 2, 2015

I measured that today, one side is 2", the other is 1.5", so I take that as 1.33. The markings on the valve were about .33 inches. I "guessed" the cam had .25" of lift based on these observations. I want to put perfect circle type seals on the intake valves, so want to make sure and stay clear of the .5 mark. I might have goldberg regrind the cam with more lift, but want to make sure.

David G · Oct 2, 2015

The .5" mark I am talking about is a groove that is in the valve stem. I do not know what it is for, but it is really in my way to get more valve lift and still seal the valves.

Dieseltech · Oct 3, 2015

Set up a dial indicator in a push rod socket on both intake and exhaust lobes..

mark49 · Oct 3, 2015

The groove you see should have a small retaining ring in it to keep the engine from swallowing a valve should the keepers fail. Stock cam lift is in the .240"-.250" range and duration is @180 degrees. You probably will need different valve springs to prevent coil bind if you want to go over .500" lift at the valve (easy to do with Murphy's 1.95 ratio rocker arms and a more aggressive cam grind). I believe stock rockers are 1.5 ratio but I could be wrong.

Mark G.

David G · Oct 3, 2015

I found my old measurements, and had it at .210, so it adds up pretty close.

MH44 Cam

David G

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Dieseltech

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David G

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David G

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Dieseltech

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mark49

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David G

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