Because I am sprucing up the old small block 350 I have been cruising the performance forums for information as well as scanning exhaust systems. My boat came with aluminum glenwood headers (not logs) and from what I have read they appear to be performance manifolds. Can anyone enlighten me on these as it am unable to find them on other Donzi (pics... anyway). I do know that the original motor was a Ford and at some point in the 80's (before I bought it in 1990) the engine was swapped for a small block 350.