You answered your own question so why would you need another response? Your question: What's the deal with the huge primaries? Your answer: All you need for a small-block is 1-5/8" primaries, unless it's a full race motor. Further proof of your motive here. It was totally rhetorical and you were in no way interested in a real answer. Oh, now you are since someone called you on it. Speaking of not answering someone's question, I really enjoyed your response to Mav Dude's question related to adjusting his carburetor for altitude. All he wanted to know was where the adjustment screw was located on the carb. You proceeded to give a long-winded response but never tell him where that screw is located. Thankfully, someone came along to give him the answer for which he was looking. Everyone here knows exactly who the "ass" is. Sounds like you need a hug.
Sorry TL, but you are wrong.... No other way to put it. Its alright though. I was wrong yesterday, and I'll probably be wrong today. FredH, good to see you around. :bananaman
Boy this has been a fun post I'm glade it wasn't me for a change I'm building a street boss 302 and I have 1.750 primaries which are smaller than anyone sells for boss 302's. 1.875 are what I have seen. You guys should like this...........I did some math to figure out what size primaries would be best. Here it goes I hope you all can follow using a Mr Gasket exhaust gasket to port the head to 1.750" x 1.250" = 2.1875" of area. To convert a diameter to area the formula is (side = diameter x .8862) then you multiply side x side. So 1 5/8" primary = 2.07" of area 1 3/4" = 2.40" of area 1 11/16" = 2.228" I don't see 1 3/4 to big and I don't see 1 5/8 to small. I'm sure this is not the perfect way to pick headers but I thought it might shine a different light on the subject.
There are some people who have a propensity to argue on this board instead of discussing the various demensions of a subject. I can asure all that the parameters for exhausting an engine have not, at all, be fully addressed in this thread . To say a peticular size is 'the' size is foolish thinking. For street engines that don't see the other side of 5500 rpm to often, the smaller diameters are preferred if streetable torque is of value. The BOSS engine is a confuguration that favors like 4000 up to take advantage of the engine breathing ability and even if smaller pipes were used the engine is still a hi rpm engine and lower end torque will be down so needs a lot of rear gear to do justice to that engine. Exhaust system design is dependent on many factors being length, diameter, inside finish, bend radius, where the pipes come togather, collector length, cam timing, temperatures. Admittedly these are all optmizing parmeters that can never be fully applied to a street car for practical reasons but arguing single parmeter points is fruitless and just deteriorates into chest enlarging matches for entertainment. Time to grow a little beyond those things.
well thanks for all the posts guys... im just gonna buy the 1 5/8" from hooker the #6901hkr ill make em work. btw...1 1/2" headers are better than cast manifolds....all day long
B#LL$#!T. The title of his thread was how to adjust for altitude, and since I live in the same state he does, I offered my educated advice. Excuse the hell out of me for forgetting to mention where the screw was. As for the other crap you said, I already stated that I'm not gonna waste anymore time on you. I have better things to do...
Easy guys. This'll get locked. I do not agree that 1'-5/8ths headers are the only appropriate size for the street on windsor motors. 393-408-427 stroker applications with AFR 205 or 225 heads can benefit greatly from larger primaries, if not just to avoid reversion alone. Look at the size of those exhaust ports.
