hey. Z351 is/was a ford motorsports 9.5 deck aluminum block with 4 bolt mains. i think either dry sump or wet. ok, for heads? well i sort of went out of control here. for years and years i've been a Gurney Weslake/Eagle fan. so i sent my GW's to the "head guy", who pronounced that to support much over 350 " of displacement the changes were as long as your arm. long and short of it is 2 years later, we're just beginning limited production of an inline valve, raised port head that basically takes the chevy sb2 intake, the ford combustion chamber and the dodge exhaust; and puts them all together. out of the box, 2.05 intake, 360cfm plus on the intake and over 80% on the exhaust. awsome at low lift to max area under the curve. i'm just changing foundrys now, and hope to have things more together in a few weeks. for induction i'll use a proprietary 4bbl intake; although we have an eye popper of an efi intake not yet patterned or cast. my head designer does a lot of nascar and other related work. he says almost everyone really stretches, being charitable here, the flow of their heads. says he's never been able to duplicate quoted #s on his bench. my heads will take up to a 2.19 intake, and will, according to the designer, easily go over 400 with some cnc work. and all this 'cause i'm a gurney fan. these heads are not stock architecture. no bolting the stock 351 intake up to them... but, if you want the flow, things have to change. we'll be deciding soon how the "distribution channel" will work. so stay tuned. i'll also be glad to post my 427W (ok, 435) results when it's finished up. we also have a couple of race teams who are willing to test an existing shortblock for us. also, they can't be run with a "usual" ford pattern "exhaust heavy" cam. they flow way too well on the exhaust side.
rd