fabbing a dual exhaust with stock headers

[old_1966_GMC]

my truck has a 305 with stock headers i want to keep the headers regradless of what i have to do to make this works i want to fab my exhaust to duals ive done the research on trying to keep it with stock headers but no luck so now my luck come to the replys on this thread and all the help from u old & new timers that have done it. PICS are a big plus and other that look forward doing the same thanks. Marco

[blackedoutharley]

Are we talking about a 305 V-6?

And what do you mean "stock headers"?

If you want a good, well made exhaust system go see Dennis @ Mel & Son's on the Ave north of MacDonald just past where 80 crosses over... they are on the right side as you head north.

[old_1966_GMC]

i stay right down the street from them to be honest i never though about going to ask aslo stock meaning factory original headers. really tend to do this on my own also.


also the 305 is a....

[lakeroadster]

I am guessing that by stock headers he means stock exhaust manifolds?

[jonzcustomshop]

yeas. what he wants ids to use the stock 305 v6 exhaust manifolds, and run duals all the way back, instead of the crossover...

I would say either get a shop to do it, probably would not be too much $$, ofrif you want to do it yourself,places like speedwaymotors.com will sell you bends and lengths of pipe, and hangers, so you can do it yourself..

[old_1966_GMC]

thats what im trying to say honestly im new to the 305E engine and the 66 gmc ride this just the first project im ganna be working on for awhile im still a young guy so still many years to comes thanks for the help

i ganna do this exhaust myself

[vin63]

Originally Posted by old_1966_GMC

...i ganna do this exhaust myself

That's great to hear! For me, the part that usually takes the most time building custom exhausts are the bends that attach to the manifold flanges or collectors on shorty headers. Check with some of the exhaust accessory or parts suppliers for the correct transitions and some J- or U-bend tubing (sometimes local muffler shops will sell you left over bends for pretty cheap). Good luck and post some photos when you can.

[onequickchevy]

I built my own exhaust once a long time ago. We stayed up all night on Friday to get the new engine inmy old 76 c10 shop truck, got it all hooked up and running, but the muffler shop closed at 12 on Saturday. Not to be denied i took some pipe, torch heated and bent it and threw on some old mufflers and mig welded it all together. Took twice as long, sounded like a pulpwood truck and backfired anytime you let off the gas. I was young and impatient. That was my first and last exhaust install. For 200 bucks including the flowmasters (real not fake) my 63 sounds great. That's what I would do, but I don't have the patience of Job. I hope you do.

[old_1966_GMC]

thats the way im trying to go is buying the flow master 50 serise muffler and the dual exhaust piping kit but the problem i had was i dont want to mess with the exhaust manifold, is it possible to cut a few inches under the exhaust where the manifold and exhaust bolt together

[onequickchevy]

I have headers, but on manifolds, most exhaust guys will not undo the flange. (They are afraid to either break a hard to get part, or snap off rusty bolts.) Instead they will drop down 3 or 4 inches and cut the pipe off, then flange the new pipe over the existing and weld it up.

[old_1966_GMC]

with you this why i really dont want to mess with them even dough i still want them on it wouldnt such an easy fix

[old_1966_GMC]

i also need some help trying to decode my vin number for a 66

[Matt's k5]

www.6066gmcguy.org could help you there ton of info on our trucks, i had a great exhaust guy do mine duel shorty glasspacks out the side in front of my rear tires with chrome tips for 289$ sounds great and period correct for my truck took him 1 hour to do!!!

[nomrlz]

exhaust work is like gutters on a house. way too much time that ends in way too many leaks when you do yourself and the pros do it purdy cheap