The Ford Barn

38 coupe · 04-12-2024, 08:56 AM

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?

04-12-2024, 08:56 AM	#30
38 coupe Senior Member Join Date: May 2010 Location: South Texas Posts: 1,671	Re: NOS 8RT camshaft 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?