Re: NOS 8RT camshaft
Quote:
Originally Posted by 38 coupe
Now we need to figure out what valve lash this cam is designed for.
The earliest 8BA cams used the same lobe design as the 38-48 cam.
The later (late 1949 and on) cams had a new design lobe with different "ramps"
The lash is different between the two cam designs:
early intake: 0.010-0.012
early exhaust: 0.014-0.016
later intake: 0.013-0.015
later exhaust: 0.017-0.019
Looking through the 49-51 Ford F-Series Truck Shop Manual it shows 8RT part number camshafts use the later lash settings. Anyone have any other information?
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Wow, great detective work. I was well aware of the settings and how different they are. Now we add in the rotator style valve assemblies on top of that. I did receive a PM about a method of determining lash on an unknown cam, but with my limited knowledge on the subject of camshafts I was hoping I might find something in print, since we DO know what this cam is labled and it is clear that it hasn't been altered. Scary thing is I'm leaning towards Ford lifters and I can't adjust out the tapping if needed. Maybe this is a clear case for adjustablkes.... I have 2 sets of used hollow johnsons.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)
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