46yblock (3/25/2011)
So is it .032 deep on the groove in block, and same width as cam groove?I have not done the groove behind the camshaft bushing modification so I don't know what depth it should be. I don't want to give incorrect info if I don't know.
Perhaps Ted can jump in here he has done that mod and would be the most knowledgeable as to depth of the groove behind the bushing. There was a picture in one of the previous posts as to the tool he used. I cannot find it at the moment. I would like to know the depth of the groove behind the bushing also as I feel that is the best of the two modifications due to the camshaft bushings wearing in and could choke down the oil flow to the top end over time especially if your are running higher valve spring rates.
Playing devils advocate now these engines are not normally our daily drivers anymore. Would it wear into the bushing if we only put under 10K miles a year and running stock valve springs?
I have seen many high milers with the groove deepened in the camshaft still oiling the top well.
The after market cams I have measured were between .014" -.017" deep also.. There were some aftermarket camshafts about ten years ago that were about .013" deep. These camshafts were bad news for top oiling. The original Ford camshafts I have measured were about 021" deep.
How we arrived to use the figure of .032" for depth was we had a fleet of school buses with 292's in the early 60's that had bad top oiling problems. The original camshafts were .021" deep and not oiling sufficient, the group of us mechanics felt 50% deeper would be a good starting point. It proved to work well.