I use to run NHRA stock, some of the fastest NHRA SB engine builders and racer said to not use the stock windage tray in the SB, I was dumb enough to not trust them so I did a A,B,A back to back teston a customers 1971 340 on a DTS engine dyno to see if they where right on the stock 340 windage tray
![](/ubbthreads/images/graemlins/image_294343.gif)
It lost HP and torque with the tray in it above 4500 RPM
![](/ubbthreads/images/graemlins/shruggy.gif)
Another freind of mine that has set several NHRA class records did use the one way oil screen on a stock cut out windage tary like on the picture on here, that works
![](/ubbthreads/images/graemlins/scope.gif)