I know what you mean. Ive had streaks of cracked everything. For instance there was about five years where I could find 915 J heads at the local yard, the same yard in fact. Then two years later I go to look for some and they are all cracked....then it was 302 heads, same thing. I sat on a set for 8 years years till i found out they were cracked. They became guinea pigs for the seat grinder , not a total loss being i also paid half price on "half price day"..