I have a cracked head, and I keep breaking thermostats, yes breaking them, they shatter as a matter of fact, and no matter how much antifreeze I pyut in, it's gone 2 days later. My heat gauge is almost to the H and I have no clue what to do. What are the parts I need, what is causing the problem, and how much should it cost to have a good mechanic fix it for me, also, how much is a rebuild kit, or even a used 420A in great shape???? Thanks guys

Are you putting the thermostat in the right direction?

TeamLSR member @ landspeedracing.com