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#1 |
Registered User
![]() Join Date: Feb 2011
Location: Murrieta, California
Posts: 234
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Straight dual or H-pipe exhaust?
I replaced the rusted out exhaust on my 1969 C/20 with a straight dual exhaust kit from LMC (poor fit by the way, the shop had to re-bend almost everything). The shop says that they will add an h-pipe for $50. My question is whether or not I should add an h-pipe and whether $50 seems fair? I have a stock 307 with a 4-speed. Thanks
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1969 C/20, 307, 4-speed, rusty with manual steering and brakes! |
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#2 |
Registered User
Join Date: Jan 2011
Location: Waukesha,WI
Posts: 25
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Re: Straight dual or H-pipe exhaust?
IMO yes H pipe is worth it and worth the $50. a x pipe would be even better but probably really hard to do with the pre made exhaust system.
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#3 |
Registered User
![]() Join Date: Apr 2008
Location: San Diego California
Posts: 1,316
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Re: Straight dual or H-pipe exhaust?
I have never seen the data between the X and H set up. The theory is the exhaust gasses from one side will help vacuum the other side. With an H pipe it seems that it would balance the sound of a dual exhaust but it might not benefit performance nearly as much as an X pipe because the exhaust gases are now trying to travel both ways in the H pipe actually slowing the flow down. Would love to see some dyno test data on the two systems.
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I'd rather attempt something great and fail.. than try something ordinary and succeed. Norman Vincent Peale Project: Barn Raising http://67-72chevytrucks.com/vboard/s...d.php?t=414961 Project: 30 Be Low https://67-72chevytrucks.com/vboard/...d.php?t=830583 Last edited by Mike Bradbury; 04-29-2011 at 08:27 PM. |
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#4 |
Registered User
Join Date: Apr 2011
Location: Phoenix AZ
Posts: 15
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Re: Straight dual or H-pipe exhaust?
Any cross over pipe in your exhaust is always a benefit, an x pipe would definitely flow better but an h pipe will equal out the pressures in the exhaust just the same, I run an h Pipe on my 72 c20 and my 69 camaro and suggest/recommend a cross over pipe of some sort to anybody, and yes 50 dollars sounds reasonable, I'd do it
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#5 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,438
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Re: Straight dual or H-pipe exhaust?
Tell them for the $50 you want two-bolt flanges so you can separate and remove the sides individually. Have them locate the flanges to one side of the crossover, so you can remove only the long side if you have to drop the trans.
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'67 GMC 2500, 292, 4spd, AC |
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Straight dual or H-pipe exhaust?
with a stock 307?
I say you'll never see an improvement, and it is probably pretty quiet already so noise isn't a factor... spend the 50 on gas |
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#7 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Straight dual or H-pipe exhaust?
Agree 100%
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#8 |
Account Suspended
Join Date: Sep 2009
Location: High Plains of Colorado
Posts: 2,485
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Re: Straight dual or H-pipe exhaust?
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#9 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: Straight dual or H-pipe exhaust?
I dont have either I went with straight duals....
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#10 |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: Straight dual or H-pipe exhaust?
Me too! And I love the sound....
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#11 |
Registered User
![]() Join Date: Feb 2011
Location: Murrieta, California
Posts: 234
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Re: Straight dual or H-pipe exhaust?
Thanks for the feedback everyone. I decided not to add the h-pipe as long as I have the stock 307. I figure going from a single 2" to dual 2.25" with that engine is probably overkill already.
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1969 C/20, 307, 4-speed, rusty with manual steering and brakes! |
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#12 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Straight dual or H-pipe exhaust?
Ime the h pipe helps get rid of the pop and cackle sound ESP on deceleration.
I bought a jegs h pipe kit. Posted via Mobile Device
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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#13 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Straight dual or H-pipe exhaust?
I remember one of the mustang rags dis a shoot out on a mild 5.0
both saw improvements. The h pipe made more of a low end difference and the x improved the numbers up top. Neither made big gains. Posted via Mobile Device
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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#14 |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: Straight dual or H-pipe exhaust?
you didn't say what size the pipe is 2.25 or 2.50"
but the h pipe will only hurt power in that 307.. and not worth it.. unless the 307 is a stop gap to something better.. total waste in a basicly stock low compression engine that never see's north of 4000rpm save your 50 bucks,, |
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