Exhaugst Help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hotrod_991 · 01-12-2010, 12:46 PM

ok as some of you already know my dad is builder me a 355 for my 77 lwb 2wd. I am tryn to figure out what I want to do with my exhaugst. I already have the pipe size headers and mufflers picked so dont worry its not another one of those polls haha. Im runnng 2.5in. and dual American thunder 40's. My debate is wether to run em straight to the axle and dump right out of the mufflers or header to midway back into mufflers then side exit before the tires. I am after that nasty loud note when i snap the throttle or cruizing, so i am curious if the bend for the side exit will make it cackle at all or sound meaner. Or just dump em. Thanks

1968SWBBigBlock · 01-12-2010, 04:19 PM

The system will layout much better if you take it back to the Axel.
Just the way the cab floor sits and were you can hang the mufflers, if you tuck them up out of the way the pipe for a side exit will go back towards the front of the truck before you can turn it out to hit the front of the tire.
You will get plenty of noise dumping at the rear axle.
FYI - if you really want an exhaust to cackle you need to decrease the diameter of your exhaust pipe - large diameters adds to a throaty sound - smaller gives you cackle - think 1.75" if you want a great cackle

hotrod_991 · 01-12-2010, 06:32 PM

Thanks for the advise, and yea I was thinking that tumping it at the axles would be easier cause its all stright. and I yea im going for the nasty throat sound so that why i was thinking 2.5. would 3in hurt damage my motor at all cause of no back pressure with no bends in the pipe?

01-12-2010, 12:46 PM	#1
hotrod_991 Registered User Join Date: Jul 2009 Location: Thibodaux, LA Posts: 479	Exhaugst Help. ok as some of you already know my dad is builder me a 355 for my 77 lwb 2wd. I am tryn to figure out what I want to do with my exhaugst. I already have the pipe size headers and mufflers picked so dont worry its not another one of those polls haha. Im runnng 2.5in. and dual American thunder 40's. My debate is wether to run em straight to the axle and dump right out of the mufflers or header to midway back into mufflers then side exit before the tires. I am after that nasty loud note when i snap the throttle or cruizing, so i am curious if the bend for the side exit will make it cackle at all or sound meaner. Or just dump em. Thanks __________________ "Buckle up I wanna try somethin!!" "of course it will hold!, I welded it!" 1977 c10 under knife for full rebuild, 5.3l 4l60e drive rain swap, replacement frame and green repaint

01-12-2010, 04:19 PM	#2
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Exhaugst Help. The system will layout much better if you take it back to the Axel. Just the way the cab floor sits and were you can hang the mufflers, if you tuck them up out of the way the pipe for a side exit will go back towards the front of the truck before you can turn it out to hit the front of the tire. You will get plenty of noise dumping at the rear axle. FYI - if you really want an exhaust to cackle you need to decrease the diameter of your exhaust pipe - large diameters adds to a throaty sound - smaller gives you cackle - think 1.75" if you want a great cackle __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

01-12-2010, 06:32 PM	#3
hotrod_991 Registered User Join Date: Jul 2009 Location: Thibodaux, LA Posts: 479	Re: Exhaugst Help. Thanks for the advise, and yea I was thinking that tumping it at the axles would be easier cause its all stright. and I yea im going for the nasty throat sound so that why i was thinking 2.5. would 3in hurt damage my motor at all cause of no back pressure with no bends in the pipe? __________________ "Buckle up I wanna try somethin!!" "of course it will hold!, I welded it!" 1977 c10 under knife for full rebuild, 5.3l 4l60e drive rain swap, replacement frame and green repaint



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