Dual Exhaust ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67chops · 09-28-2004, 12:19 AM

would adding 2" dual exhaust with glqass packs hurt the performance on a basicly stock engine? any good ideass on how to create some power and noise with the exhaust?

Longhorn Man · 09-28-2004, 12:24 AM

That should increase performance. it would be even better if you add headers too.

71Chevy4-speed · 09-28-2004, 01:34 AM

Actually stock hurts performance. 2 inch and glasspacks will be lots better than stock. What kind of motor is it? your sig says 67 truck so I'm guessing its a 327 at the most. I'd go with 2 1/4 with glasspacks. Headers would be a great add on too. Lots of flow. Most of the stock exhaust is like trying to breath through a coffee stir stick. Robs power and mileage.

dyingdeadman · 09-28-2004, 01:39 AM

yeah, what they said.

67chops · 09-28-2004, 08:12 AM

excellent. thanks alot for the information. some one elsewhere said tht the dual exhaust would ruin my performance and i thought otherwise and you all helped answer that. and its actually a later 305 in my 67.

Dean · 09-28-2004, 08:37 AM

I guess you could argue that if you went really big on your exhaust it could lower the torque with a stock engine... A could set of duals is all you really need on that 305.

stickshift_or_walk · 09-28-2004, 10:40 AM

Good point, Dean.

For the 305, I'd probably stay with 2" pipes to keep the flow up. Larger could detract from your low-end.

Glasspack noise output is a combination of diameter and length, so with a 2" diameter, you'll probably stay out of trouble with the sound police with anything 24" or longer.

If you have ambitions of a larger motor, especially bigger than 350, might want to go with the 2.25" pipes.

SSOW

71Chevy4-speed · 09-29-2004, 12:22 AM

Yeah with a 305 they are right about keeping the smaller pipe for torque, you could also invest in an h-pipe or x-pipe if you wanted that also helps torque by balancing out the tubes. Depends on what you want for sound, like they said bigger pipe rumbles more. Dean has a point about that you could argue that big exhaust will lower torque but stock is pathetic period.... its designed to be cheap, not powerful.

*rage'nrat638* · 09-29-2004, 12:27 AM

you have got to have a double hump trans crossmember to get the clearence
under the truck.....
check my store....

http://cgi.msn.ebay.com/ebaymotors/w...e=STRK:MESE:IT

http://stores.ebay.com/RAGENRAT638S-...RUCKPARTS-MORE

**lock** · 09-29-2004, 09:33 AM

Quote:

Originally Posted by rage'nrat638

you have got to have a double hump trans crossmember to get the clearence
under the truck.....
check my store....

http://cgi.msn.ebay.com/ebaymotors/w...e=STRK:MESE:IT

http://stores.ebay.com/RAGENRAT638S-...RUCKPARTS-MORE

Where do you run the pipes with that crossmember? Thru the holes near the frame rails?

09-28-2004, 12:19 AM	#1
67chops Registered User Join Date: Sep 2004 Location: Newark, DE Posts: 81	Dual Exhaust ?'s would adding 2" dual exhaust with glqass packs hurt the performance on a basicly stock engine? any good ideass on how to create some power and noise with the exhaust? __________________ -Chops-

09-28-2004, 01:34 AM	#3
71Chevy4-speed Speed Limit = Floorboard Join Date: Jan 2004 Location: Kasilof, Alaska Posts: 803	Actually stock hurts performance. 2 inch and glasspacks will be lots better than stock. What kind of motor is it? your sig says 67 truck so I'm guessing its a 327 at the most. I'd go with 2 1/4 with glasspacks. Headers would be a great add on too. Lots of flow. Most of the stock exhaust is like trying to breath through a coffee stir stick. Robs power and mileage. __________________ 1971 C20 350, 4-speed - Sold. 1985 K10 350, Built 700r4, Edel 1406, Performer intake, MSD Ign, Hooker Comps, Silverstars, Piaa drivers, LED tails, Toyo A/T 31's, Eaton Posi, the project. "Build for torque, horsepower will follow"

09-28-2004, 01:39 AM	#4
dyingdeadman Registered User Join Date: Aug 2004 Location: san marcos,tx Posts: 266	yeah, what they said. __________________ 72 GMC sierra 3/4 ton 402 bb 68 GMC 3/4 ton 2010 camaro rs: daily driver

09-28-2004, 08:12 AM	#5
67chops Registered User Join Date: Sep 2004 Location: Newark, DE Posts: 81	excellent. thanks alot for the information. some one elsewhere said tht the dual exhaust would ruin my performance and i thought otherwise and you all helped answer that. and its actually a later 305 in my 67. __________________ -Chops-

09-28-2004, 10:40 AM	#7
stickshift_or_walk Left Foot Functioning Join Date: May 2004 Location: Duncan, OK Posts: 348	Good point, Dean. For the 305, I'd probably stay with 2" pipes to keep the flow up. Larger could detract from your low-end. Glasspack noise output is a combination of diameter and length, so with a 2" diameter, you'll probably stay out of trouble with the sound police with anything 24" or longer. If you have ambitions of a larger motor, especially bigger than 350, might want to go with the 2.25" pipes. SSOW __________________ 69 C10 (#1 son's ride) 72 C20 (Dad's farm truck) 82 K30 (Ex - brush pumper project)

09-28-2004, 12:24 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	That should increase performance. it would be even better if you add headers too.

09-28-2004, 08:37 AM	#6
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	I guess you could argue that if you went really big on your exhaust it could lower the torque with a stock engine... A could set of duals is all you really need on that 305.

09-29-2004, 12:22 AM	#8
71Chevy4-speed Speed Limit = Floorboard Join Date: Jan 2004 Location: Kasilof, Alaska Posts: 803	Yeah with a 305 they are right about keeping the smaller pipe for torque, you could also invest in an h-pipe or x-pipe if you wanted that also helps torque by balancing out the tubes. Depends on what you want for sound, like they said bigger pipe rumbles more. Dean has a point about that you could argue that big exhaust will lower torque but stock is pathetic period.... its designed to be cheap, not powerful. __________________ 1971 C20 350, 4-speed - Sold. 1985 K10 350, Built 700r4, Edel 1406, Performer intake, MSD Ign, Hooker Comps, Silverstars, Piaa drivers, LED tails, Toyo A/T 31's, Eaton Posi, the project. "Build for torque, horsepower will follow"

09-29-2004, 12:27 AM	#9
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	exhaust you have got to have a double hump trans crossmember to get the clearence under the truck..... check my store.... http://cgi.msn.ebay.com/ebaymotors/w...e=STRK:MESE:IT http://stores.ebay.com/RAGENRAT638S-...RUCKPARTS-MORE



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