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| − | {{develop}}
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| − | ==Overview==
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| − | Swirl port SBC heads are often overlooked for any king of performance use. This page will weigh the pros and cons of using them in a "street performance" application.
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| − | ==History==
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| − | The swirl port heads came to be in about 1987. They were used with TBI (throttle body injection) EFI (electronic fuel injection) applications in trucks. Their reason to be was for making good low rpm torque while getting acceptable mileage.
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| − | ==Casting numbers and ID==
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| − | The 5.7L TBI truck engines used c/n 14102191 and 193 heads.
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| − | ==Design limitations==
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| − | ===TBI swirl-inducing vane===
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| − | [[File:Tbi swirl port vane.jpg|thumb|left|350px|TBI swirl port vane]][[File:Used 193-1.jpg|thumb|left|550px|TBI swirl port vane, paired combustion chambers]]
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| − | <br style="clear:both"/>
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| − | ===L30 5.0L Vortec head===
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| − | {|
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| − | |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|center|305 Vortec L30 casting number 12558059]]
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| − | |[[File:305 VORTEC CHAMBER CN 059.jpg|thumb|center|305 Vortec L30 casting number 12558059 chamber]]
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| − | |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|thumb|center|305 Vortec L30 casting ID]]
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| − | |}
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| − | ==Modifications and porting==
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| − | ==Resources==
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| − | *[http://outintheshop.com/faq/casting/castings2.html SBC head casting number go-to site]
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| − | *[http://web.archive.org/web/20080518030656/http://www.mortec.com/ MorTec archived]
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| − | [[Category:Engine]]
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| − | [[Category:GM]]
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