Aeroflow Performance now offer billet 6061 aluminium intake adapters to bolt up any cathedral port intake or supercharger to your rectangle port heads. Kit comes complete O-Rings for a sure seal.
If bolting up an LSA intake you require M6x1 x 70mm UHL bolts. When running a car intake manifold you require M6 x 130mm UHL bolts and when running a truck intake manifold you require M6 x 90mm UHL length bolts. Adapters are 12.7mm (1/2") thick.