Holley Hi Flow EFI Throttle Body 112-581 | Holley's New LS Throttle Bodies are unquestionably the biggest bore most feature loaded available. Holley went back to the drawing board and built the ultimate air valve for your LS engine. They're available in huge 105 and 95 millimeter bores with low RPM drive friendly tapers and 105 tat is all bore when WOT is all that matters.