Aeroflow Performance now offer billet 6061 aluminium intake adapters to bolt up any rectangle port intake or supercharger to your cathedral port heads. This means you can simply adapt an LSA blower or late model manifold to your early 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.