DeTomaso Mailing List: February 98, Message #129
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Hi All, Here's some ramblings on the current Aussie 2V head and intake discussion: There are open and closed chamber versions of the Aussie 2V heads. The open chamber Aussie 2V heads are, for all practical purposes, identical to U.S. open chamber 2V heads that can be picked up in the junkyard for $75 per pair. The rare (at least in the States) heads are the closed chamber versions. These heads combine a quench combustion chamber, similar to that found on U.S. closed chamber 4V heads, with 2V ports. One thing to note is, that while the chambers are similar in shape, they are not identical due to the smaller valve size of the 2V heads. I have not CC'd my heads yet but I expect the Aussie quench heads to have a smaller volume than the big valve U.S 4V versions. Also, pop up pistons meant for U.S. 4V quench heads may not fit the Aussie heads without some relieving. If I remember correctly, the Australian sourced 351's (like Paul Timko's), are truck motors and used the low compression, open chamber, heads. Interestingly enough, the closed chamber Aussie 2V heads sold by vendors like Mike Fielder are sourced from Australian *302* Clevelands. Note that Aussie 302C's are just de-stroked 351C's (like a 351M is de-stroked 400) and are not Windsor-based like Boss 302's. I had previously read that the Aussie intake ports were 10% larger than their U.S. cousins, but my measurements have not born this out. One difference I did note was the area around the valve guide is shaped differently. On the U.S. 2V heads, the area on either side of the guide forms a wall that air must flow over . On the Aussie heads, the guide is free standing and air can flow around either side. At this point, I'll note that the 2V heads are not just smaller port versions of the 4V castings. As Dave Williams has stated "Most people think the 2V heads are just smaller port copies of the 4V heads. In actuality, the ports are about as different as you can get and still match up to the valve and manifold holes. The 2V ports are raised and straightened with generous shortside radii. The exhaust port is *much* nicer than the 4V port." I have two sets of the Aussie quench heads in my garage. The odd thing is that one set has the 2V marking cast in the corner and the other has a 4V casting mark. A variety of one piece stainless steel valves are available in stock 2V sizes (2.04"/1.65") and Ford Power Parts also stocks oversize intakes (2.08"). Likewise, a variety of intake manifolds are available. Here are the ones I know of: Edelbrock Performer 351 2V (P/N 2750) - low rise dual plane with Holley carb bolt pattern Edelbrock F-351 2V - low rise dual plane with Holley carb bolt pattern - out of production, replaced by Performer 351 4V Offenhauser Dual Port 351C-2V (6011-DP) - dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries feed shorter path upper runners), Holley carb bolt pattern Offenhauser Dual Port 351C-2V (6012-DP or is it 6111-DP) - dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries feed shorter path upper runners), spread bore bolt pattern Offenhauser Port-O-Sonic 351C-2V (6122) - high rise single plane with Holley carb bolt pattern Offenhauser Port-O-Sonic 351C-2V (6123) - high rise single plane with spread bore carb bolt pattern Offenhauser Dial-A-Flow 351C-2V (6128) - high rise single plane with Holley Dominator carb bolt pattern - has interchangeable "turtles" to adjust plenum volume and floor shape Weiand X-Celerator 351V-2V (7516) - low rise single plane with Holley carb bolt pattern Holley Street Dominator 351C (300-12) - low rise open plenum single plane with Holley carb bolt pattern - universal fit for both 2V and 4V heads - out of production Unfortunately, no high rise dual plane manifolds exist for the 2V heads. I spoke with FPP about a 2V version of the 4145 high rise and they thought it was a good idea and said they would suggest it to their Blue Thunder rep. FYI, FPP does not manufacture the 4145 intake, they just sell it. The manifold is made by A.T. Francis, a.k.a Blue Thunder Products. I've been meaning to call (760-328-9259) and see if I can talk them into tooling up for one but haven't got around to it.. I have three 2V intakes (Weiand X-celerator, Edelbrock F351-2V, and Holley Street Dominator) in the garage that I've picked up along the way. One of these days, I'll get around to bolting up the Aussie heads and testing them out. I have some 2V flow numbers stored off somewhere that I'll post when I get a chance. Later, Dan Jones