Description Aussiespeed Holden V8 253, 308 high rise tunnel ram intake manifold. The Aussie speed Holden V8 tunnel ram manifold suits red, black, blue motor cylinder heads some extra drilling will be required to suit the 3 different styles of Holden 253 and 308 red, black, blue motor cylinder heads. The centre valley cover holes are semi drilled on the underside for all 3 models. THE TUNNEL RAM BASE IS 150mm high from the top to the bottom of the manifold sitting flat on a bench The Aussiespeed Holden V8 Tunnel Ram manifold offers interchangable tops 1×4 barrel 2×2 barrels 2×4 barrels 6/71 GM supercharger top You are purchasing the base only
