I see advantages and disadvantages on both sides. But some of your statements are misleading IMHO. Here's the differences I've noted. I will try to state them objectively, but of course, I have a bias oppinion.
The biggest difference is the Argie heads are readily available, which is not true with the OZ heads. They are in fact, almost impossible to locate nowdays, and will only get worse. Which also drives the price up, unfortunately.
It is my understanding that SP stands for "SPRINT" not "Special Performance" as explained to me by the foundry.
Headers for the Argie head are available here in the US (produced by the same manufacturer that makes Clifford's) but at a higher cost. On a side note: the headers that were posted in the pics don't appear to be mandrel bent and the bends look collapsed, or is this an optical illusion? I am assuming these were headers produced in AR, not here in the US, and imported?
The OZ heads may need to be rebuilt at an additional cost, but you can put in the oversized valves at the same time. Only the guides need to be replace to use all "American" shelf products (including headers), which is a minimal expense. The Argie heads use the same stock valve sizes as US heads, so you would still have to pay to have the oversized valves and new larger seats installed. Side note: What you spend to get new headers for the Argie head, can be spent on the rebuild, off setting some of the cost as well. Providing you already have headers on your existing setup. Otherwise this is a mute point.
As for the carb being turned 90*, this may or may not be an issue. Ford (both in AR and OZ) saw fit to install it that way on the Argie ME, the OZ 250-2V, and even into the latter Crossflows. So did Redline, Lynx (and others) who produce performance intake manifolds. Is there any research to support your therories? Are there any articles published to this end? I know we have discussed this in the forum, but I'm just wondering if there is any documentation on how it effects performance.
Your flow numbers may be wonderful (we are all waiting to see the numbers posted, but you refuse to do so publicly for some strange reason) yet we have to remember that these heads were professionally ported and polished. I would venture to say that the OZ heads would flow nearly as well, given the same attention, and quite possibly better on the intake side. Rather than all talk and conjecture, I challenge you (see below) to prove me wrong? I will admit that the exhaust side should flow better, hopefully much better. But would still like to see the numbers. I can only think of one reason for you not to post them, but of course, thats your decission.
I have posted the flow numbers on a OZ head (in its stock form) several times over the past few years. And they are posted in my website as well,
for everyone to see as I was proud to post the results. Yet, as we have discussed in this forum several times over the past years, flow numbers can be deceiving. The same head, tested on different days, by different operators, under various conditions, on different machines, can yield varied results to a large degree.
You make it clear that the Argies have been getting 300 plus HP for years. But with what other mods? Are you implying that just an Argie head, the header, and a 2V intake will push our sixes up over the 300 mark, or that it simply has the potential to produce it? Heck, even a log head has the potential, but its not naturally aspirated is it? I would venture to say, the same engine with the same mods and with an OZ head (given the same attention), would produce nearly the same. But again, that's conjecture and is yet to be proven. I would like to see flow numbers on a stock Argie head, and not one that has been re-worked to the max, so as to
compare apples to apples.
Bottom line here, in my opinion, the two heads are fairly equal in performance, with an edge going to the Argie head due to the split exhaust. It has been said that port dividers will improve this situation on the US and OZ heads, but has yet to be proven from my understanding. Some of our members have even removed them, for various reason. Altho, I do think they assist in reducing header gasket failures. Of course, the Argie head elliminates this totally. The down side with an Argie head, is having to purchase and install a new exhaust system (which may have already been done at a costly expense).
Taking this a step father, I would like to see an Argie head and an OZ head both in stock form flow tested by the same operator, on the same machine, under equal conditions. Then have them ported and polish professionally, and re-test again. This would settle the debate once and for all.
I'm up for it, and would be happy to supply an OZ head. Thus am extending a challenge to you to supply an Argie head. And I'll have it done, so it won't cost you a penny. Of course you are invited to see the results for yoursleves.
Don't get me wrong here, I'm all for the Argie heads. So much so, that I have been talking with Inliner over the past few months on the possibilities of importing these in mass quantities. Primarily because the Argie heads are readily available and knowing the comparitively low cost on them. For the past year and a half, I have been working towards the goal of producing new 4V and 3x2V intakes (designed by a reputable company with years of proven experience), which will require a very large investment on my part. I am also looking into the possibilities of producing a quality header using one of the largest US manufacturers (known for their quality), and at a lower price too boot. Obviously, if I were not convinced as to the performance gains of the Argie heads, I would not invest the future of FSPP in them.
I just don't understand why you are all so intent on slamming the OZ heads, other than to support your own personal ventures? Which happen to be the same as those of Ford Six Performance Parts and myself. I have referred customers to Clifford, and they to me. Which is the way business should be conducted, as it is in the best interest of the hobby and all involved. This is my primary concern and the reason FSPP was founded in the first place. Quality, service, and value. Sure, I've had my problems and made some errors. But I've also done everything in my power to assure my customers were happy in their dealings with FSPP.
Slamming the competition, without or without proof, is poor business practice (and risky). I pride myself and my company on quality parts, and let my services and prices speak for themselves. FSPP has a loyal customer base as a result, and word of mouth carries the FSPP reputation, and it's future.
Many thanks to William & the rest of you.
As for the challenge, if you accept, lets get on with it. I think it would be great to put this to bed once and for all. And compare apples to apples.
Have a Merry Christmas and a Very Happy New Year.