by megavega » Thu May 03, 2012 12:03 am
heres more. Before I forget, when you cut the tubes, the edges will have burrs and you want to remove those. I use my porting tool but you can just use a sanding roll arbor in a cordless drill to get the same thing, clean up the inside of the tube and the outside edge, sometimes i also will hold the tube flat on a peice of sandpaper sitting on a bench top to get the exact fit if i am off a tad bit on my cut, just keep checking your fit and draw referance lines to refer back after fine tuning your trims.
second set of pics will show you what happens when you turn your cuts and how it changes the angle in which the tube will follow, by spinning them watch the distance and the outlet angle as marked in the pic. I showed how I just figure out where I want my collector, weld some scrap to it and then start fitting your tubes to the desired hole in the collector where you want it to go. ( I removed the exh flange just to show how you want to keep the tube up flush to the exh pot on the head), so later when your ready to weld tubes to flanges youll make it easy on yourself. Some engine have a square exh port and round tube , so youll heat up the tubes and form them to the square hole via a drift pin and tapping it, then welded to flange to seal it up.
I dont build headers for a living , I am no expert but this has whats worked for me with good results. Have built a few sets for all kinds of cars and engine combo's, hopefully some of you guys will dive in and try it, just take your time and you can do it, heck, I have so I am sure you can.
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Last edited by
megavega on Thu May 03, 2012 8:55 pm, edited 2 times in total.
1972 hatchback, 28,000 orig miles, 427BBC/twin T4 turbo's/T56 six speed/big wheels, lowered down pro touring style-work in progress....
1973 vega wagon-under the blue flame knife.