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inch. I welded a fitting shut and got a .052 inch size drill to make the restrictor. The factory restrictor is slightly bigger. BB require less oil than non BB .  
 
Arizona'a most powerful 600HP 15 second Z More powerful than a stock TT , slower than an NA   Dynoed 515 rwhp and 420 ft.lbs  @ 16psi 89 degrees.         533 rwhp and 450 ft. lbs @19 psi and slipping clutch          and heat soaked motor , 85 degrees.  
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