... .5mm 3.0mm) LS (LS2 / LS3 / LS6 / L92 ) Professional Flap Top:(standard Bore:4.000" and 4.065". Rings:1.2mm ... :1, Comp.Ht. 1.115, -5cc Dome Vol, 4032 alloyFlat Top,4.030''Bore, Rod lgth 6.125", Comp Ratio11.6 ... :1, Comp.Ht. 1.115, -5cc Dome Vol, 4032 alloyFlat Top,4.005''Bore, Rod lgth 6.125", Comp Ratio10.6 ... 1, Comp.Ht. 1.315, -5cc Dome Vol, 4032 alloyFlat Top,4.060''Bore, Rod lgth 6.125", Comp Ratio11.6 ...