Editing Swirl port SBC heads (section)
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==Design limitations== Its not that Swirlies outflow Vortec, its that they burn better and require less timing, generating more net torque. Less total timing = less negative work on the crankshaft as cylinder pressure is building. Up to 4,500 rpm many other heads cannot touch them. Where Vortecs like up to 12-16* of advance right off idle and as much as 32-34* total at high rpm, the Swirlies run best with only 4-6* of timing off-idle and 26-30* at high rpm. ===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]] |}
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