Looking for something with better flow than stock manifolds suggestions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**blazercrazy70** · 07-22-2014, 12:38 AM

Looking for some ideas on replacing the stock manifolds. Will the vette or camaro ones bolt on so that the exhaust is easy to put on or are headers a better way to go. Or should I just leave the truck manifolds

crazy longhorn · 07-22-2014, 05:05 AM

I don't think that you will find the truck manifolds to fit on the LS swap. The trail blazer ss manifolds have been used, & look to fit well on an auto trans app. I used a set of Hooker streetrod shorties, as they cleared all of the mechanical clutch linkage. Auto trans, or hyd clutch setup, you have more choices? I will let the rest of the guys "chime in", as to app & fit...Longhorn

Custom 68 · 07-22-2014, 08:45 AM

I did run a set of ls6 manifolds off a zo6 they fit, I then swapped to a set of midlength Camaro manifolds, I now have a truck manifold on the drivers side plumbed into a turbo.
I made my own mounts and did slightly "clearance" the top of the frame rail. It was slight.
I do remember an article in hotrod a year or 2 ago and they did dyno testing, the ls6 style performed within 2 or 3 hp of headers. I believe the trailblazer manifolds are similar. Unless you are building a high reving high horsepower motor I don't think you will see a lot of difference between anything you use. You can chase the last few hp with a lot of dollars.

ivorton74 · 07-22-2014, 10:27 AM

how does the Camaro manifolds flow compared to the truck ones? I was gonna go with headers but was told the Camaro ones I got flow great and don't need headers.

Custom 68 · 07-22-2014, 12:47 PM

http://ls1tech.com/forums/generation...manifolds.html
http://www.carcraft.com/techarticles...e_header_test/

check out these 2 articles. There is probably a ton of other web information. I just remember the carcraft article.

07-22-2014, 12:38 AM	#1
blazercrazy70 Senior Member Join Date: Sep 2006 Location: illinois Posts: 516	Looking for something with better flow than stock manifolds suggestions Looking for some ideas on replacing the stock manifolds. Will the vette or camaro ones bolt on so that the exhaust is easy to put on or are headers a better way to go. Or should I just leave the truck manifolds

07-22-2014, 05:05 AM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Looking for something with better flow than stock manifolds suggestions I don't think that you will find the truck manifolds to fit on the LS swap. The trail blazer ss manifolds have been used, & look to fit well on an auto trans app. I used a set of Hooker streetrod shorties, as they cleared all of the mechanical clutch linkage. Auto trans, or hyd clutch setup, you have more choices? I will let the rest of the guys "chime in", as to app & fit...Longhorn __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

07-22-2014, 08:45 AM	#3
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Looking for something with better flow than stock manifolds suggestions I did run a set of ls6 manifolds off a zo6 they fit, I then swapped to a set of midlength Camaro manifolds, I now have a truck manifold on the drivers side plumbed into a turbo. I made my own mounts and did slightly "clearance" the top of the frame rail. It was slight. I do remember an article in hotrod a year or 2 ago and they did dyno testing, the ls6 style performed within 2 or 3 hp of headers. I believe the trailblazer manifolds are similar. Unless you are building a high reving high horsepower motor I don't think you will see a lot of difference between anything you use. You can chase the last few hp with a lot of dollars. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-22-2014, 10:27 AM	#4
ivorton74 Registered User Join Date: Nov 2011 Location: South Dakota Posts: 916	Re: Looking for something with better flow than stock manifolds suggestions how does the Camaro manifolds flow compared to the truck ones? I was gonna go with headers but was told the Camaro ones I got flow great and don't need headers. __________________ 1983 C10 Silverado 5.3 swap 1974 C10 lwb 5.3 swap(sold)...http://67-72chevytrucks.com/board/sh...d.php?t=614122 2001 BMW 530i 5 speed 2019 Nissan Titan SV Midnight 1979 Datsun 210 4 door 1980 Datsun 120y(back home in Trinidad)

07-22-2014, 12:47 PM	#5
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Looking for something with better flow than stock manifolds suggestions http://ls1tech.com/forums/generation...manifolds.html http://www.carcraft.com/techarticles...e_header_test/ check out these 2 articles. There is probably a ton of other web information. I just remember the carcraft article. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

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