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Post by 69Rebel on Mar 8, 2019 19:55:49 GMT -8
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Post by spud on Mar 9, 2019 16:54:49 GMT -8
Basically those are to show the fit and ground clearance of the header. The header on the left side is a hedman. I plan on using a 904 with the 304, and the headers are set up to clear a 904. Plenty of room with that ford toploader. The upside down pic shows how close the #6 tube came to the crossmember. If you look close you can see the crossmember had been trimmed some. I did that when i put a 351 ford in it many years ago. So it played in on the construction of this set some. I will have to trim the new crossmember in the six cylinder car in like manner. Note the small size of the new header flange. When the other header is done, im going to weld up a dual 2” exhaust with a crossover and borla straight through mufflers Going with small pipe for a small engine and low end response. If you look on the floor of one pic you can see a 2.5 inch exhaust with flowmaser one chambers. This is my 401 street/ strip javelin in the pics. I may just try to make some 1-3/4 inch headers for it. Not quite sold into buying the 1-3/4 dougs headers for it. Making 1-1/2 inch tubes fit a header flange is pretty easy with the trailer ball “ die”. Just a matter of stretching the tube out.i will have to develope a new method for squuezing 1-3/4 tube down to fit the header flange. Guess that will be another chapter in header fun if you all can stand it.
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Post by 69Rebel on Mar 14, 2019 14:01:54 GMT -8
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Post by spud on Mar 14, 2019 16:51:13 GMT -8
First pic is drivers side progress. Note the number one tube is merged to #5, and 3 will merge with 7, to split up the sequential 5-7 firing event. This side is proving tough to do, routing and configuring the tubes to clear, engineering the 1-5 and 3-7 pair up, clutch linkage steering column stuff going on. You have to work out the configuration many steps ahead as you cut a bend, another one and try the fit, count the inches, its a hassle, you end up with parts cut, fit, and basically figured out before you can weld anything. See the yellow dots? Those tubes are marked in inches to help figure the layout. #7 tube is next, two days figuring how to snake it to squeeze in the 28” length and get it to end up next to the 1-3 merge in the exact spot so the secondary tubes start and stop in the exact spot needed to make them the same length so they merge correctly. # 3 is last and judging from the space left its gonna be hard. #7 is quite snakey as you will soon see. Theres a topside view of the completed passenger header installed, and some pics of the borla pro xs muffler, 2 inch, straight thhrough. Interesting note is summit lists them at 90$, i had enough summit bux to get them for FREE, and got a free t shirt too! I had to use em or lose em so i made good use of them. Yeah i know gee spud 2 inch is small dude. I aint worried . I’m thinkin they will be plenty for what i’m doing. Im erring to the small side... for torque and response, thinking “performer not racer” so let the big horsepower dreamers put big pipes on their 304s. Dont you know this setup is gonna sound good too.😎 including the merge in the exhaust crossover, there will be 8 hand cut, fitted and welded tubing merges. I just thought of that😳
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Post by 69Rebel on Mar 14, 2019 17:23:05 GMT -8
Good idea on the yellow dots.
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Post by spud on Mar 14, 2019 18:03:23 GMT -8
Yeah since you got that smokin heliarc, i’m showing you enough to give you the keys to the kingdom. I figure if i can build headers, it cant be all that hard. Im a jack of all trades and a master of none.
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Post by 69Rebel on Mar 14, 2019 18:40:32 GMT -8
I ain't never built no headers. I don't know if a guy has to be a genius to do it, but he sure as hell needs to be dedicated and persistent. And fairly competent. Being a genius, or at least really smart, probably helps quite a bit.
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Post by spud on Mar 14, 2019 19:07:20 GMT -8
Well hmm. I think my point is that making headers is doable. You dont need bullqueer level genius, cad and cnc, you know areospace shit, you can get it done with hand tools and a oxy acetylene rig. Its just a good way to have fun and relax and create something unique and somewhat experimental to tune up some power. I consider this entry level metal fab, hotrodding heritage, old school, carguy r&r , get unplugged and away from the wife time. Turn on the radio and melt some metal . I can do some stuff. If i had the equipment i would like to sand cast aluminum stuff like intakes, thing is ol edelbrock makes such good shit its just not worth burning myself trying.
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Post by Captain Awesome on Mar 14, 2019 19:13:59 GMT -8
Small is good. As I said before, my bud had the chit hedmans untouched on his car with 2 1/4 exhaust. He uncapped it and it became a horrid dog. The 2 1/4 pipes gave him 100 ft pds of tq. He had too much cam, but the engine sucked the whole way past 6000 uncorked.
In gAyMC land they all want 500 carbs, but 2 1/2" duals. lol
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Post by n2ojoe on Mar 14, 2019 20:32:01 GMT -8
Nice work Spud! Well thought out and excellent fit/clearance. I can't wait to see the real world results.
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Post by 69Rebel on Mar 14, 2019 21:00:49 GMT -8
Well hmm. I think my point is that making headers is doable. You dont need bullqueer level genius, cad and cnc, you know areospace shit, you can get it done with hand tools and a oxy acetylene rig. Its just a good way to have fun and relax and create something unique and somewhat experimental to tune up some power. I consider this entry level metal fab, hotrodding heritage, old school, carguy r&r , get unplugged and away from the wife time. Turn on the radio and melt some metal . I can do some stuff. If i had the equipment i would like to sand cast aluminum stuff like intakes, thing is ol edelbrock makes such good shit its just not worth burning myself trying. I dunno if I would call building headers entry level. It takes an awful lot of planning, patience, and perception.
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Post by Captain Awesome on Mar 14, 2019 21:24:23 GMT -8
Yeah, 1000s of gAyMCers struggle with installing a pre-made dipstick tube.
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Post by Captain Awesome on Mar 14, 2019 21:31:19 GMT -8
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Post by javtwotone on Mar 15, 2019 5:03:57 GMT -8
My two-tone Javelin had an X-pipe and cut outs just before the mufflers. Having the cut outs after the x-pipe gave it a unique sound when they were opened up. Even had several people at the standing mile competition comment on it. One guy said it was the best sounding car there! Anyway, I wonder what the tri-y's would do to the sound with that set-up, or would it not affect it after the X-pipe?
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Post by spud on Mar 15, 2019 6:29:55 GMT -8
Well i havent considered cutouts. I have considered megaphones. If youcan see the 2.5 inch exhaust on the floor under the car in the one pic , that is a good example of what the new exhaust will be. Kind of short and sweet, nothing after the mufflers. Takes maybe ten minutes to drop off or put on...Then i can add some megaphones, or tubes, for the track. Not as convenient as cutouts,, but more tuneable. But cutouts are a cool idea ... if they were squeezed in just before the mufflers, and the megaphones put on the cutouts, poof instant side exhaust. That might be pretty cool. The thing is, these mufflers are straight through and offer pretty much zero resistance anyways. I have used dynomax ultraflows, pretty much the same. They are awesome mufflers. You can lightfoot them and they are pretty tame, but when you nail the throttle dowm omfg the world is ending. Kind of like a cutout, just fully automatic. Lol. So think about the whole system, small tube. Long length, tri y’s tuned for low end but no slouch on the big end, small tube hi velocity,merged for hi capacity, ( like two mufflers on the end of each pipe) with straight through borlas... jesus there aint gonna be any backpressure. There will be hi velocity and sharp response, with power off idle. My belief is people who put on too big of a low restriction exhaust is they lose low end power because “ it needed the backpressure” well thats horseshit. It needed the velocity of flow, and it aint got nun till you get the revs up. Just think about cappy’s bud’s gremiln... when the headers (1-5/8 tube 4 into 1’s) were run open it was a dog... 304’s have smokin plenty of culinder head port area... taking flow velocity out kills them.... So this topic is a study and a demonstration in exhaust tuning,keeping, or better still enhancing, flow velocity and decreasing ( in a major way) backpressure, to open up high rpm performance channels, adding exhaust tuning for increased scavenging. All part of a comprehensive approach to any “ level” or “ size” naturally aspirated performance engine. And so what if its going on a stock 304. It wont hurt anything trust me.
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