Vortec L31 cylinder head
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The Chevrolet L31 5.7L Vortec cylinder head is the best flowing production head Chevy has made for the Gen I SBC engine to date. Because of this, it has become a very popular swap. | The Chevrolet L31 5.7L Vortec cylinder head is the best flowing production head Chevy has made for the Gen I SBC engine to date. Because of this, it has become a very popular swap. | ||
| − | The name "Vortec" can be confusing because GM used that name for their V6 and V8 truck engines as far back as 1985. But the heads that are being referred to here are from trucks and SUVs produced from 1996-2002. | + | The name "Vortec" can be confusing because GM used that name for their V6 and V8 truck engines as far back as 1985. The origin of the term Vortec was for a combustion chamber design with a ramp port which debuted with the 2.0L motor used with the GM J platform (Cavalier et.al.) which twists the fuel mix similar to a tornado vortice, hence the Vortec nomenclature. But the heads that are being referred to here are from trucks and SUVs produced from 1996-2002. |
They are made of cast iron, have 170cc nominal intake runners, and 64cc nominal combustion chamber volume (actual volumes may vary due to production tolerances and/or modifications done previously, so volumes, especially the combustion chamber volume, has to be determined by measuring, or "CC'ing" the chamber). | They are made of cast iron, have 170cc nominal intake runners, and 64cc nominal combustion chamber volume (actual volumes may vary due to production tolerances and/or modifications done previously, so volumes, especially the combustion chamber volume, has to be determined by measuring, or "CC'ing" the chamber). | ||
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