Header design
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The majority of torque "lost" from the bottom end of the power band has actually been moved upwards in the powerband, into the midrange. This can help performance during highway driving and towing, and may provide better passing power when needed. A more powerful midrange tends to make the low end seem less powerful, simply because the engine pulls better in a different part of the RPM range. Most people that think they lost low end power are simply noticing that the engine pulls better in a different way, even if NO low end power was ever lost. | The majority of torque "lost" from the bottom end of the power band has actually been moved upwards in the powerband, into the midrange. This can help performance during highway driving and towing, and may provide better passing power when needed. A more powerful midrange tends to make the low end seem less powerful, simply because the engine pulls better in a different part of the RPM range. Most people that think they lost low end power are simply noticing that the engine pulls better in a different way, even if NO low end power was ever lost. | ||
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==180 degree exhaust system== | ==180 degree exhaust system== | ||
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==Gaskets== | ==Gaskets== | ||
| − | + | There are many different types and sizes of header gaskets on the market today. Composite are common, as is fiber types. The composite gaskets seem to hold up a little better, all else being equal, but the main thing is to retighten the header bolts often- like every time the engine is heat cycled- until the fasteners take a set. | |
| − | + | [[File:Foil exh gasket sbc1.jpg]] | |
| − | If/when the gaskets take a dump, try a set of the foil backed composite gaskets that come in most rebuild gasket sets | + | {{!}}Remember- keeping the bolts tight is very important to keeping the gaskets from burning out. |
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| + | For the SBC and any other engine that uses these gaskets as a stock replacement: If/when the gaskets take a dump, try a set of the foil backed composite gaskets that come in most rebuild gasket sets. If they'll fit the head and header ports, they will work as good as most any more expensive composite gasket if the bolts are kept tight. | ||
Regardless of what gasket that is used, trim the ID to fit the largest port, be it the header or the head port so there's no overhang into the port. After trimming, start all the bolts and just drop the gaskets into place. Other header gaskets can have the bolt holes slotted in the same way as the foil backed gaskets shown above, for easier installation. | Regardless of what gasket that is used, trim the ID to fit the largest port, be it the header or the head port so there's no overhang into the port. After trimming, start all the bolts and just drop the gaskets into place. Other header gaskets can have the bolt holes slotted in the same way as the foil backed gaskets shown above, for easier installation. | ||
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*Wikipedia article on [http://en.wikipedia.org/wiki/Manifold_%28automotive_engineering%29 exhaust manifolds] | *Wikipedia article on [http://en.wikipedia.org/wiki/Manifold_%28automotive_engineering%29 exhaust manifolds] | ||
*[[Headers]] | *[[Headers]] | ||
| − | + | * http://www.wallaceracing.com/header_length.php | |
[[Category:Engine]] | [[Category:Engine]] | ||
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