Gun-drilled AAH cams...
 

Try as I might this is the best pic I can come up with of the gun drilled cam bores. This is a shot thru the front (see the machined flat for diamond-shaped pulley washer).

Shop that was supposed to do this misunderstood and "low-balled" me on the $150 price over the phone. However, in their defense when I got there they admitted up front they misunderstood and would split the difference with me. Still made em over $400 if I let them do it. When they found out I had a lathe they told me how to make an adapter that could be built for less than $100. They even ran me some CAD plans of their adapter free of charge. They didn't tell me the drill bits to do this would cost well over $400ea and that 2 should be used, ie" one for drilling a small "pilot" bore and the next for drilling to finish size. Dont wanna break these drill bits!!

But I have a whole new appreciation and understand of why they would've had to charge me so much. Takes an entire (LONG) day just to gun drill a pair of these and another day to drill/tap the rear of the left cam for Heli-Coil or threaded insert to re-install hall plate for CPS (cam position sensor) after drilling it's threads out.

I'll get a weight-savings on this mod later in the week (still have to disassemble the extra AHH heads to get the cams out) but I'm guessing I removed 1/2 lb per cam or more. Whatever a forged 12" x 9.5mm iron rod weighs. But at least 1 pound for the pair.

And I know that some are thinking eminent failure/doom on the horizon for me with this one. But I'm thinking it aint EVER gonna happen. I spent a lot of time researching and talking with people on this topic. I've left far more wall thickness than they recommended using both incrementally and percentage-wise numbers and my cams are forgings while their's are mostly cast billets.

Next I'll send these out and have em re-heat treated and surface hardened, further increasing their strength. I'll also be doing a high tech surface friction treatment. I'm also going to see what kind of specs I can pick up from a custom grind. I'll stick to grinding only and not go with any metal-plasma build-up enhancement that would add lift. I'll see if I can make em better, increase duration and by how much or stronger performing for my specific state-of-build with my custom heads and that pesky 6,300 redline. If I can improve the performance, pick up some additional torque I will. If not I'll run em as-is after heat treating, surface hardening and surface anti-wear coating.