welcome aboard . Early on way back, source got bashed a bit & I think there were some quality control issues with their heads/water pumps which I believe have been resolved & alot of people (on here) have used their stuff with a few issues with the valve train gear but alot of people are happy with them expecially stealth heads & you need to have any mailorder stuff from anyone gone over by your local trusted/competent machinist. I'm gonna pull the trigger on a 535 RB source stroker kit (go big or go home) as soon as those slick talking lawyers in California settle up for their insured driver tboning my daily driver