EFI Intake Manifold with Fuel Rails Fit for GM Gen III/IV LS1/LS2/LS6 Cathedral Port 300-137 534-219 77044843OEM Part Number 300 137 534 219 HH6313S HH0862S HH6449RS Fit For the Following Models Fitment: Fits for GM Gen III or Gen IV LS engines with LS1 LS2 LS6 cathedral port cylinder heads Features: Optimized runner layout and constant cross sectional area broad torque curve Minimum carb flange height fits most vehicles with minimum hood modifications Cast aluminum construction great manifold for LS swaps, centrifugal blower, turbocharged or NOS power adder