Oliver 77 and 1550 rocker arms

Ollie88D

Member
Does anyone have information of the differences between 77/Super 77 rocker arms and those from a 1550? I noticed the 77 arms are ferrous, whereas the 1550 rockers are aluminum. I don't have the part numbers from them but can get them if it would help. Are the ratios the same? I'm considering a set of Murphy's high ratio (1.9) rockers for a pulling engine. Thanks.
 
Are you sure the rocker arms are aluminum? The supports are aluminum. The 1550 rockers have the same part numbers as late 88 rocker arms and they never were aluminum.. The 77 rocker arms oil different than later rocker arms.
 

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