Editing Swirl port SBC heads

{{develop1}} ==Overview== Swirl port SBC heads are often overlooked for any kind of performance use. This page will weigh the pros and cons of using them in a "street performance" application. ==History== The SBC swirl port heads came to be in about 1987. ==Casting numbers and ID== The 1987-up 5.7L TBI truck engines (also some marine engines) used c/n 14102191. Casting number 14102193 heads were also used on 1987-up truck engines and is also used on the 305 RPO LO3 engine. Both heads use center bolt valve covers. *191 have 76cc combustion chambers *193 have 64cc combustion chambers ==Design limitations== ===TBI swirl-inducing vane=== [[File:Tbi swirl port vane1.jpg|thumb|left|350px|TBI swirl port vane (arrow)]][[File:Used 193-1.jpg|thumb|left|550px|TBI swirl port vane, paired combustion chambers]] <br style="clear:both"/> ===L30 5.0L Vortec head=== Some info and photos of the L30 5L Vortec head at [http://www.nastyz28.com/forum/showthread.php?t=56505&page=32 post 478]. {| |[[file:305_VORTEC_SWIRL_RAMP_CN_059.jpg|thumb|220px|center|305 Vortec L30 casting number 12558059]] |[[File:305 VORTEC CHAMBER CN 059.jpg|thumb|500px|center|305 Vortec L30 casting number 12558059 chamber]] |[[File:L31 305 VORTEC HEAD CASTING ID.jpg|500px|thumb|center|305 Vortec L30 casting ID]] |} ==Modifications and porting== *[http://www.youtube.com/watch?v=QMkCV1s5BQ8 Video] showing port work on a c/n 193 swirl port head. ==Resources== *[http://www.mortec.com/castnum.htm SBC Heads casting numbers] by Mortec *[http://outintheshop.com/faq/casting/castings2.html SBC head casting number go-to site] [[Category:Engine]] [[Category:GM]] [[Category:Cylinder head]]

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