roller rockers
#3
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Join Date: Oct 2000
Location: Kentucky - where the women are so fast we have to put a governor on 'em!!
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Talk to FelPro - I think they make a double-thickness V-C gasket that might give you enough clearance. I used a set on mine, and it gave me just enough clearance for a set of Comp Cams full roller rockers with poly-locks. Valve covers were not stock, but they were not the tall ones either. About all you can do is assemble the valvetrain and check for clearance. I think we had to machine a little bit of material from two of the rockers because of interference with the valve cover near the indentation for the valve cover bolts. Pay particular attention to this area.
#4
Charter Member #737
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They use them on HP 500 motors. The oil drip tabs need to be removed. I know my stock valve covers would not work with Merlin heads.
#6
speel chekk this fokker!
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Join Date: Feb 2001
Location: Locust Valley, New York
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what roller rockers will work in a mark IV 7.4??? Is it even worth adding them? I am re-intstallign my b&m 174 blower so i figured i might do roller rcoker while she is apart
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#7
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I have the same rocker covers, and use Comp cams SS rockers. They required longer studs and this put the polylocks on the exhaust in contact with the covers. I didn"t know this at first, but noticed my engine builder had used double gaskets. Since I did not want double gaskets that might leak, the solution was to turn the polylocks on the lathe to make them shorter.
#9
Charter Member #30
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here is a picture of the hp500 rockers look closely and you will see that one had to be modified. If you want a picture of the inside of the cover let me know. They use standard oring style gaskets.
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Last edited by Scott; 03-19-2002 at 10:37 PM.