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11-22-2012, 03:25 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Correct 454 Exhaust Pipe Diameter?
My mid 70's 454 has massive 3" pipes all the way to the back, what is the factory OEM pipe diameter? If it's not 3", could the pipes being to large hurt my performance?
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11-22-2012, 03:34 PM
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#2 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Correct 454 Exhaust Pipe Diameter?
The stock diameter on my 79 454 were 2 1/2".
I've run dual 3" on mine for years with the 454 (now a 502) with long tube headers and quality mufflers. Works great. |
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11-22-2012, 03:42 PM
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#3 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Correct 454 Exhaust Pipe Diameter?
Your fine. Your exhaust manifolds are killing more power at this point
Posted via Mobile Device
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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11-22-2012, 03:52 PM
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#4 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Correct 454 Exhaust Pipe Diameter?
You still have manifolds?
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11-22-2012, 05:25 PM
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#5 |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Correct 454 Exhaust Pipe Diameter?
My r30 TBI 454 truck has factory 3 inch single exhaust.
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11-22-2012, 11:23 PM
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#6 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: Correct 454 Exhaust Pipe Diameter?
LOL, yep I've still got stock exhaust manifolds! I do plan on getting headers one of these days but right now I'm just trying to keep it running as good as I can for as cheap as I can! Anybody got a cheap set of big block headers laying around?
Quote:
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11-24-2012, 08:45 AM
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#7 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Correct 454 Exhaust Pipe Diameter?
don't know if you have these but some grinding may help keep it cheap and flow better
i always find the sound gets louder/better smooth out the flow has gotta help
__________________
John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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11-24-2012, 10:27 AM
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#8 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Correct 454 Exhaust Pipe Diameter?
If you are really bent (or rule restricted) to keep the stock manifolds, after initially porting on them like Motornut mentioned above, I send them out to be extrude honed. Keeps that stock appearance and picks up several HP
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