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04-17-2008, 11:49 PM
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#1 |
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Registered User
 
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Headers and Flowmasters
My truck has a 330 HP GM crate motor that is great. I added some Hooker Competition headers and the muffler shop is adding 40 series Flowmasters with 2 1/2 inch pipe and equalizer pipe before the mufflers. I am wondering about how much extra horsepower I will realistictly get out of this combo. May I say that the headers alone on the truck were loud
 It sounded so loud last night that my neighbors thought someone got shot haha
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72 C20 Longbed 05 1500 Z71 |
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04-18-2008, 12:02 AM
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#2 |
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Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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Re: Headers and Flowmasters
I'm thinking around 20 more
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1997 GMC Sierra Ext 1965 Mustang |
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04-18-2008, 12:07 AM
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#3 |
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Registered User
Join Date: Feb 2005
Location: Carl Junction, Missouri
Posts: 2,061
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Re: Headers and Flowmasters
extra compared to open headers? anywhere from 5-20. mainly backpressure which helps acceleration.
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04-18-2008, 12:42 AM
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#4 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
I had 2 left half stock manifolds and I didnt even know it until I pulled them last night. It was running crappy with them they always came loose at the collecter. Im sure it will run better now.
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72 C20 Longbed 05 1500 Z71 |
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04-18-2008, 03:12 AM
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#5 |
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Registered User
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
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Re: Headers and Flowmasters
not sure about power...not a great deal i dont imagine..BUT.
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04-18-2008, 04:25 AM
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#6 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Headers and Flowmasters
I'd go a little higher on a guess, given that the GMPP engines usually *expect* headers and say 25-30 FWHP.
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04-18-2008, 08:42 AM
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#7 |
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Registered User
Join Date: Jun 2007
Location: Boca Raton, FL
Posts: 476
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Re: Headers and Flowmasters
+/- 20 ponies of boilt on hp, which ain't bad.
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Joe Last edited by chevychase; 04-18-2008 at 08:43 AM. |
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04-18-2008, 08:43 AM
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#8 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
You are absolutely right about the motor expecting headers. The manual it came with said to use headers with at least 2 1/4 pipe if my mind serves me correct, The 2 1/2 and the flows and Hookers are a great combo my heavy Chevy gets up and moves the 6000 lbs quickly and loudly !!! I love it ! I even got a thumbs up on the freeway as I passed up a Mopar as I floored it
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72 C20 Longbed 05 1500 Z71 |
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04-18-2008, 01:56 PM
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#9 |
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Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
Posts: 24,461
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Re: Headers and Flowmasters
Premium72... what's your specs on the suspension?
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-Nate  1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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04-18-2008, 09:37 PM
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#10 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
My suspension is all stock 2WD on a 3/4 ton. I had no clearance issues with the full length headers. They do ride lower than the lower A arms but my truck is stock height so thats not a problem. These are not a good choice for slammed or bagged trucks. My muffler guy did a great job of running a clean set up I ended up pointing them out the side behind the tires
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72 C20 Longbed 05 1500 Z71 |
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04-18-2008, 10:16 PM
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#11 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
the rear suspension is stock leafs he went over the axle. I didnt get the equalizer pipe "x" because then my driveshaft would be a pain to get out if I needed to
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72 C20 Longbed 05 1500 Z71 |
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04-18-2008, 11:58 PM
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#12 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
Let's see some pictures. I would like to see how low it hangs?
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04-19-2008, 02:42 AM
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#13 | |
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454 MAKES IT ROAR
Join Date: Jan 2008
Location: Essex, U.K
Posts: 2,701
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Re: Headers and Flowmasters
Quote:
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Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger |
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04-19-2008, 08:02 PM
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#14 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
Im trying to load pictures but it keeps failing to upload Ill try to have them up later
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72 C20 Longbed 05 1500 Z71 |
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04-19-2008, 08:07 PM
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#15 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
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04-19-2008, 08:28 PM
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#16 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: Headers and Flowmasters
I sent them over Desertpos
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72 C20 Longbed 05 1500 Z71 |
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04-19-2008, 09:18 PM
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#17 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
Maybe try again, I didn't get them. Make sure to put an underscore between 'lab' and '227'
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04-19-2008, 10:01 PM
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#18 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
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04-19-2008, 10:02 PM
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#19 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
 
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04-19-2008, 10:02 PM
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#20 |
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Registered User
Join Date: Sep 2007
Location: Arcadia, CA
Posts: 78
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Re: Headers and Flowmasters
 
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04-19-2008, 11:21 PM
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#21 |
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Registered User
Join Date: Jan 2008
Location: austin texas
Posts: 202
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Re: Headers and Flowmasters
That looks like a pretty nice setup. It tucks up in there pretty good.
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Mike 68 C10 LWB midnight blue metallic 307ci, 700R4, HEI front discs, leaf spring rear tilt steering wheel, stock ride height, rally wheels, 2007 Dodge Charger(Hemi) |
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