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Author Topic:   header ?
robhbk24
Dirt Freak

Total posts: 372
posted January 09, 2005 07:33 AM  
due to rules changes we can use them this year.no step or merge and no 180 degree. max pipe size 1 5/8 crossover are legal. i'm running a metric chassis with no pass side fire wall but on the driver side the engine is right up against the fire wall. how do crossover headers cross over ho much room is needed and where is it needed.with regular headers i may have clearance problems underneath due to the fact that this is a non perimeter car and there is 2x3 tube running straight back off the front stub on the pass side and the driverside has basically the same except it follows the contour of the tranny tunnel. the floor pan is level with the top of the frame rail and the tube is above the bottom frame rail so i really need to know how low your average set of headers are? would they be able to go underneath the driver side tube if they had to? pass side should not be a big prob cause the frame is further over the same as on a mod but the driver side will be tricky. i'm looking into a set of shorty headers built for a 3rd gen camaro how much will i be giving up with these? they would fit perfect in my application.our track is almost always extremely dry slick so a few hp here or there will not make a diff we already have more motor than tire. any help would be great.

robhbk24
Dirt Freak

Total posts: 372
posted January 09, 2005 09:55 AM  
just got a chance to go look and measure, it looks like unless i want to cut out a whole bunch of frame work or move the whole firewall back along with my pedals and everything else that i'll have to use the 3rd gen short style.any suggestions on who makes the best ones. i see headman i think makes short ones for a g car anybody use these before? for the most part there are only a couple of guys in our class that could use crossovers without doing a ton of work so i am mainly going to be competeing against convential style headers.

leapinlizard
Dirt Freak

Total posts: 402
posted January 10, 2005 08:37 AM  
OPtimum header lenght comes from several deminsions such as, RPM, bore, cam timing, VE and others. As a general rule, SBC with a coventional firing order like about 32-36 inches for max torque. To answer your question, go buy somwe pre bent tubes from summit or jegs and build your own. Takes a bit of time, but you get better results. I can post a formula for header lenght if you want it.

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