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05-16-2013, 05:09 PM
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#1 |
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Registered User
Join Date: Nov 2012
Location: Az
Posts: 26
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Rectangular port intake on oval port heads
This question has probably been beat to death so I apologize.
I have 454 with with closed chambered oval port heads ( 3872702 ) and the intake that came off it is a factory aluminum rectangulat port intake ( 6269318 ) I know it will *work*, but what are the pros and cons ? Not looking for the fastest truck on the strip, just a mild daily driver I can do burn outs in. I don't want to sacrifice a bunch of low end to gain high end, which I don't need. Any thoughts? |
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05-16-2013, 05:19 PM
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#2 |
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Registered User
Join Date: Feb 2013
Location: Orange, Calif
Posts: 183
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Re: Rectangular port intake on oval port heads
the issue is your ports are a mismatched and the smaller oval port is impeding the flow out of the big intake ports. For an everyday driver not a real big deal but you would be better off to buy a matching oval port intake.
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05-16-2013, 05:30 PM
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#3 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Rectangular port intake on oval port heads
If those were how your engie came I'd wonder what else is needing attention. Best bet would be to pick up an oval port intake. New or used and get it flowing right.
__________________
Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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05-16-2013, 05:32 PM
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#4 |
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Registered User
Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
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Re: Rectangular port intake on oval port heads
Yep, I agree with the guy's, buy the proper intake, will run nothing but better.
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05-16-2013, 06:31 PM
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#5 |
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Cluster King
 
Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Rectangular port intake on oval port heads
I also agree. The ports in the intake and cylinder heads need to match as close as possible.
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05-16-2013, 10:08 PM
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#6 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Rectangular port intake on oval port heads
This is why engine builders do port matchng.To smooth the flow transition from intake to head.
__________________
The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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05-17-2013, 08:09 PM
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#7 |
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Registered User
Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
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Re: Rectangular port intake on oval port heads
Plus the port velocity will be down (slower) with the rectangular ports in general, a smaller oval port is way faster, hence the better bottom end than square port design.
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