GFB Mach 2 Atmosphere Conversion Kit-Changes T9103 or T9133 from Recir to Atmosphere Fans ARP 260-4702 HEAD STUD KIT

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GFB Mach 2 Atmosphere Conversion Kit-Changes T9103 or T9133 from Recir to Atmosphere Fans ARP 260-4702 HEAD STUD KITMACH 2 ATMO UPGRADE KIT TO CONVERT MACH 2? FROM RECIRC TO ATMO VENTING BOV, WITH TRUMPET, SPRING AND PLUG. Harder spring supplied in this kit, as the valve needs to remain closed at idle when venting to atmo, to prevent stalling backfiring.