Swirl port SBC heads
From Crankshaft Coalition Wiki
(→Resources: Added Mortec heads link) |
(added comment in Design Limitations) |
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==Overview== | ==Overview== | ||
| − | Swirl port SBC heads are often overlooked for any | + | 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== | ==History== | ||
| − | The SBC swirl port heads came to be in about 1987 | + | The SBC swirl port heads came to be in about 1987. |
==Casting numbers and ID== | ==Casting numbers and ID== | ||
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==Design limitations== | ==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=== | ===TBI swirl-inducing vane=== | ||
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==Modifications and porting== | ==Modifications and porting== | ||
| + | *[http://www.youtube.com/watch?v=QMkCV1s5BQ8 Video] showing port work on a c/n 193 swirl port head. | ||
==Resources== | ==Resources== | ||
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