Like many others I fought that issue too many times. I went to a Billet Specialties housing with an O-ring. They have a nice thick base to prevent warping. I don't use any sealer and I haven't had any leaks. I've had three of them on three different race cars. If you don't have to have a stock looking housing, these are great.
That's a good housing.. I've used the O ring style and have found that over time even those will weep from expansion/contraction..Now if I use that style I add a little RVT to help the sealing duties ...
