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08-27-2014, 06:10 PM
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#1 |
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Senior Member
 
Join Date: Jul 2012
Location: Knoxville, TN
Posts: 499
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Exhaust on 69 GMC V6
Recently my brother and I have been talking about upgrading his exhaust after we do the Holley 500 cfm carb conversion on his 305e V6. According to 60-66GMCGuy.com, a single 3" pipe is the ticket on these engines. That sounds simple enough by I was talking to my exhaust guy and he pointed out that the stock y-pipe is going to be much smaller. This in turn will make it diffcult on him plus it seems contradicary to the larger exhaust. What have others done to the y-pipe?
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1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
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08-27-2014, 11:07 PM
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#2 |
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Registered User
 
Join Date: May 2007
Location: Deale Md
Posts: 4,663
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Re: Exhaust on 69 GMC V6
I just put 2 1/2 dual exhaust on my 305 V6 that has the holley 500 on my 64.
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James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change! |
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08-27-2014, 11:32 PM
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#3 |
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Senior Member
Join Date: Jul 2012
Location: Knoxville, TN
Posts: 499
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Re: Exhaust on 69 GMC V6
That may be the way we go. I just don't see the point of putting a 3" wide pipe on small y-pipe.
__________________
1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
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08-28-2014, 12:16 AM
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#4 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,650
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Re: Exhaust on 69 GMC V6
3'' is way overkill for only 305 cubic inches. 2 1/2'' single would be more than plenty
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08-28-2014, 09:42 AM
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#5 |
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2WD Jimmy
Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,565
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Re: Exhaust on 69 GMC V6
duals on that 305 will make it sound like a tractor.
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08-28-2014, 10:13 AM
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#6 |
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Senior Member
Join Date: Jul 2012
Location: Knoxville, TN
Posts: 499
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Re: Exhaust on 69 GMC V6
I would agree if it were a sbc, but it isn't. It is a big block V6. It makes around 300 ft lbs so a single isn't unjustified.
__________________
1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
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08-28-2014, 11:28 AM
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#7 | |
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Registered User
Join Date: May 2007
Location: Deale Md
Posts: 4,663
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Re: Exhaust on 69 GMC V6
Quote:
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James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change! |
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08-28-2014, 11:54 AM
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#8 |
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Senior Member
Join Date: Jul 2012
Location: Knoxville, TN
Posts: 499
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Re: Exhaust on 69 GMC V6
It will have a flowtech raptor on it more then likely. It's a good sounding turbo style muffler. I have you on a 4.3 Sierra and it sounds great.
__________________
1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/ |
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