New block, a further discussion

[Fordors]

In Post #94 Andy mentioned that the valves had been moved .090 away from the cylinders by altering the angle the lifter bores were machined on. From my experience as a budget (if there is such a thing) nitro racer the low buck racers will buy used parts. When buying a camshaft for a 426 Chrysler there are two lifter angles for aftermarket aluminum blocks, 45°, which is the stock angle and 48°, used in raised cam blocks. Just to be sure that a cam is in fact ground for 45° we always degree the cam , naturally using no. 1 cylinder and then checking no. 6. If they don't match then the cam was ground for the 48° or vice-versa. I know the flathead was not changed by raising the cam tunnel but changing the lifter angle had the same effect on the lobes, the cam timing is not as designed. I don't know how much the lifter angle changed, maybe it is not enough to matter but that 3° change in angle makes a big difference to our engine.