My gaskets were leaking oil pretty bad so over the winter so I took down the heads and replaced them, honed the cylinders, replaced the rings and put it all back together (per manual instruction). Its running great, but now I'm getting A TON of valve chatter. I have adjusted the gaps about 4 or 5 times now to no avail. Every time I check them after running the motor, the adjustments seem to be off. I do make all adjustments with at top dead center. Am I completely missing something? I'm doing .004 in and .006 out.