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11-08-2009, 05:07 PM
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#1 |
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Registered User
Join Date: Jul 2008
Location: Vancouver BC
Posts: 448
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454 Exhaust
Hey,
I have a 454 bbc in my 78 jimmy. It has a quadra jet 4 barrel, long tube headesr, RV cam,HEI, and duel glass packs. The exhaust is only 2 1/4, is that too small for this motor? Im looking to swap the glass packs out(preferr the deep tone of a flowmaster than that blaat). If im going with 1 chamber flowmasters, would that cause too much back pressure? thanks
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1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's |
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11-08-2009, 07:58 PM
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#2 |
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Right on the line, baby!
Join Date: Oct 2003
Location: Phila, PA 19130
Posts: 1,486
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Re: 454 Exhaust
Should be no problem at all with the RV cam.
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83 GMC 406 th400/3.73 Eaton Truetrac posi, headers, x pipe, & racePros. Tubular control arms, lowering rear springs, caltracs. Still ugly, but getting built right, although slowly Click and scroll down for site vendors! Subscribe here! |
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11-08-2009, 08:54 PM
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#3 |
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Registered User
Join Date: Jun 2005
Location: Grand Junction , CO
Posts: 602
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Re: 454 Exhaust
1 chamber flowmasters are really loud. Mainly for race cars that require a "muffler", 2 chamber would sound nice and good
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71 swb 4x4, 37" Iroks, t400/205 496 77 CJ-7, Narrowed Dana 60 Lockrite, 14 Bolt Spool, 4.56 gears, 39.5" boggers. 360 t-18/d20 |
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11-08-2009, 09:03 PM
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#4 |
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3/4 Ton Rodder
Join Date: Jan 2009
Location: Manlius, IL
Posts: 1,146
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Re: 454 Exhaust
I can only imagine how that 454 sounds with the same setup as my 350. It cracks with mine, it must sound mean on yours.
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1981 Chevy Scottsdale C20 "Orange Crush": SOLD 1989 Chevy Silverado K2500: All Stock (For Now), 350 TBI/700R4. DD/Light Duty Toy. |
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11-08-2009, 09:54 PM
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#5 |
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Registered User
Join Date: Jul 2008
Location: Vancouver BC
Posts: 448
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Re: 454 Exhaust
ok thanks for the info. The 40 series is a 1 chamber right? i liek the loud, i just like the deep tone of the flowmaster rather than the glass pack
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1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's |
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11-09-2009, 01:44 AM
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#6 |
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Registered User
Join Date: Jun 2005
Location: Grand Junction , CO
Posts: 602
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Re: 454 Exhaust
40 series is the 2 chamber
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71 swb 4x4, 37" Iroks, t400/205 496 77 CJ-7, Narrowed Dana 60 Lockrite, 14 Bolt Spool, 4.56 gears, 39.5" boggers. 360 t-18/d20 |
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11-09-2009, 05:08 PM
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#7 |
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motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: 454 Exhaust
2.25 is good for about 350hp or so. I had almost the same setup on the 454 in my '69 (it is a '79 model engine) except I was running manifolds and 2.5" pipes with flowtech afterburner mufflers. 2 chamber FM's will sound good on that 468.
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac   Use the SEARCH function on this forum - it is your friend!! |
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