sent this letter to Delta cams today...
I am sorry to report this but I am experiencing a significant problem with the Subaru cams you reground to your delta 1500 profile. See the attached pictures of the assembled valve train.
On the intake side, you have taken off so much meat off the intake lobes that my brand new tappet adjusters are completely out of adjustment capability. I have carefully measured the cams, and all the intake lobes require that I move the adjusters 0.070 to 0.080 inches (1.81 mm to 1.97 mm) farther into the rocker arm (i.e. towards the valve relative to the stock cam). The new tappet adjusters are the same length as the old ones.
As a result, there are only a few threads of the adjuster locking nut engaging the adjuster screw. There are NO threads exposed above the locking nut.
If I have any wear at all on the adjuster tips, rollers, or cam I will be unable to adjust them further.
I do not have as large a problem with the exhaust lobes. Since the exhaust rocker arm ratio is smaller I have only had to move the adjuster screw 0.059" to 0.063" (1.50 mm to 1.62 mm) towards the valve, and this leaves about zero to 1 thread of the adjuster screw exposed above the adjuster locking nut.
The intake profiles have had 0.015 to 0.020" removed (up to 1/2 mm!) from the max lift point, and the base circle has had 0.041 to 0.043 inches removed relative to stock.
In comparison the exhaust lobes have had 0.004 to 0.007" removed from the max lift point, and the base circle has had 0.038 to 0.041 inches removed.
The extra material removed from the intake lobes is compounded by the larger rocker arm ratio for the intake rockers.
If you had controlled the amount of material removed from the intake profiles more closely, these cams might have been useable, but as it stands now I would be very uncomfortable proceeding with the engine assembly.
I think you owe me some new cams. If these cams are typical of your regrind tolerance/practices then you will have this problem in the future as well.
intake-adjuster.jpg photo by 5322009 | Photobucket
exhaust-adjuster.jpg photo by 5322009 | Photobucket
cam profile measurements
cammeasurements.jpg photo by 5322009 | Photobucket