Exhaust - The 1947 - Present Chevrolet & GMC Truck Message Board Network

My72BB · 11-09-2007, 08:26 PM

Did 72 Chevrolet PU's have factory dual exhaust? If so was it 2 1/2" all the way?

Alan

Jtrux · 11-09-2007, 08:40 PM

I think it was just a 2.5 single all the way to the back, maybe a 2.25 single but no dual unlesss there was some dealer installed exhaust i've never heard of.

72402 · 11-09-2007, 08:53 PM

Judging by your username, I'm guessing you have an original big block truck. If so, then it would have had dual exhaust from the factory, with 2 1/2" pipe back to the mufflers and 2" tailpipes. At least that's the way mine was set up.
Frank

My72BB · 11-10-2007, 08:59 AM

When I got my truck back in 1978ish, it had about 80k on the odometer and it had dual exhaust. I don't think it was factory as the mufflers where different and the tailpipes where different sizes. I know the left side was factory but right side was add on. I cannot remember how it looked up where the "Y" pipe was but I think it was modified also.

The other thing that makes me think duals where not an option from GM on the P/U's is up to 74 I cannot ever remember seeing duals on the PU's...especially the Big Block trucks.

Back then the first thing everybody wanted to do was hack the mufflers off and put Cherry Bombs or Thrush Mufflers...Or even straight pipes...which I can vouch that straight pipes on a Big Block might sound cool but absolutely does not help the performance under 4,000 rpm.

**jerry moss** · 11-10-2007, 09:08 AM

duals were factory on big block trucks, 2 1/2" headpipes, 2" tailpipes. smallblock trucks all had single exhaust .

11-09-2007, 08:26 PM	#1
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Exhaust Did 72 Chevrolet PU's have factory dual exhaust? If so was it 2 1/2" all the way? Alan

11-09-2007, 08:40 PM	#2
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: Exhaust I think it was just a 2.5 single all the way to the back, maybe a 2.25 single but no dual unlesss there was some dealer installed exhaust i've never heard of. __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

11-09-2007, 08:53 PM	#3
72402 Registered User Join Date: Nov 2004 Location: Cameron, Oklahoma Posts: 199	Re: Exhaust Judging by your username, I'm guessing you have an original big block truck. If so, then it would have had dual exhaust from the factory, with 2 1/2" pipe back to the mufflers and 2" tailpipes. At least that's the way mine was set up. Frank __________________ 72 Cheyenne SWB Fleet/original 402, TH400, buckets & console 65 C10, 350TBI, 700R4 (work in progress)

11-10-2007, 08:59 AM	#4
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: Exhaust When I got my truck back in 1978ish, it had about 80k on the odometer and it had dual exhaust. I don't think it was factory as the mufflers where different and the tailpipes where different sizes. I know the left side was factory but right side was add on. I cannot remember how it looked up where the "Y" pipe was but I think it was modified also. The other thing that makes me think duals where not an option from GM on the P/U's is up to 74 I cannot ever remember seeing duals on the PU's...especially the Big Block trucks. Back then the first thing everybody wanted to do was hack the mufflers off and put Cherry Bombs or Thrush Mufflers...Or even straight pipes...which I can vouch that straight pipes on a Big Block might sound cool but absolutely does not help the performance under 4,000 rpm. Last edited by My72BB; 11-10-2007 at 09:00 AM.

11-10-2007, 09:08 AM	#5
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,915	Re: Exhaust duals were factory on big block trucks, 2 1/2" headpipes, 2" tailpipes. smallblock trucks all had single exhaust . __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

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