51 JD A roller rockers

nfrank0908 · Sep 28, 2015

I was thinking about adding a set of Murphy's roller rockers to my tractor. Was wondering what kind of gains I might see?

Motor:
-6.125 bore power block. Stock stroke (398ci)
-Murphy's off the shelf high compression pistons (8.5:1)
-stock head that has been ported and bigger valves machined in.
-gasket matched intake manifold

Last time I had it on the dyno it ran 47HP

nfrank0908 · Sep 28, 2015

And on the note of performance... does anyone know of anyone that will PTO dyno tune a tractor in NE Ohio?

Early B · Sep 28, 2015

47 hp seems a little low for that combo. Roller rockers & a cam will really help. Im in
western N.Y. & can dyno your tractor, but im sure theres some one closer. Give me a
call if you want to chat
607 377 0763

nfrank0908 · Sep 30, 2015

That is what I have been thinking. I was hoping for about 65 when I put it together..

nfrank0908 · Sep 30, 2015

How far into NY are you.. I am only about 1.5 to 2 hours from NY.

51 JD A roller rockers

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