Tom: I have no idea what is causing your problem,BB pans may be different from the SB pans,but at worse, should be very similar......Also, Canton makes the same pan on outward appearance,one is listed as as "Street " pan,it has the same identical dimentions as the one listed as "Road Race Pan", but does not have the baffled trap doors....otherwise they are identical pans....there is nothing in the bottom of the sump, all this pan does is increase overall
oil capacity.....
On that note,I've raced my car over 8 seasons at Hallet in Tulsa,The Nashville SuperSpeedway road course in Nashville, VIR in Virginia,Barber MotorSports in Birminham and Grand Bayou here in Louisiana and have not seen any drop in
oil pressure other than about 3 to 5 psi on very rare occasions while racing,and not always in the same turn......My normal
oil pressure at speed with oil temp from 180 to 250 degrees is 55psi.....I've made it a point to check the oil pressure gauge visiually in some long high speed sweeping turns and have not seen the gauge move, even had my in-car camera focused on the oil pressure gauge to verify this and I also have an oil pressure warning light set to come on at 20 psi and I've never seen it come on as of yet,except on start-up.....I'm also using a Melling High Performance oil pump in standard pressure/standard volume......
I've also run my street car with a 351-W with a Canton Road Race pan at Hallet,Nashville,Barber and Grand Bayou with no loss in oil pressure....
I'll try to post pics of my pan, inside there is worlds of difference bewteen the Canton pan I have and Pete's AVAID pan.....I think Pete's problems are pan related over time....his engine did last 10 years and 16,000 miles though...
David