My engine has an IAII block, an aftermarket timing cover, and E-brock water pump, and a Supercharger manifold from BDS...I blocked the by pass as per BDS's directions....Truth be told; I have no idea why it is recommended
I do therefore differ to the expertise and knowledge of the engineers...C.Railsback, T.Vaught, et al.....Whom I also thank for their patience, and information...Eric!