Vortec L31 cylinder head
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==Overview== | ==Overview== | ||
| − | The L31 | + | The Chevrolet L31 5.7L Vortec cylinder head is the best production head Chevy has made for the Gen I SBC engine to date. Because of this, it has become a very popular swap. |
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| + | The name "Vortec" can be confusing because GM used that name for their V6 and V8 truck engines as far back as 1988. But the heads that are being referred to here are from trucks and SUVs produced from 1996-2002. | ||
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| + | 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). | ||
Because of the superior port and combustion chamber designs, total timing requirements for maximum power is 4-6 degrees less than the earlier non fast burn heads. | Because of the superior port and combustion chamber designs, total timing requirements for maximum power is 4-6 degrees less than the earlier non fast burn heads. | ||
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The L31 Vortec head will bolt directly onto Gen 1 small block Chevrolets. They will also obviously work on L31 engines (sometimes referred to as Gen1+). They are not compatible with Gen2 (LT1 or LT4) engines. They are also not compatible with any of the current LS engines. | The L31 Vortec head will bolt directly onto Gen 1 small block Chevrolets. They will also obviously work on L31 engines (sometimes referred to as Gen1+). They are not compatible with Gen2 (LT1 or LT4) engines. They are also not compatible with any of the current LS engines. | ||
| − | There are | + | There are some inherent costs associated in swapping from 1995-back heads to the L31 Vortec heads. Here is a list of items to be purchased and/or labor associated with the upgrade: |
* L31 heads | * L31 heads | ||
* Springs if the cam has a valve lift over about 0.420" | * Springs if the cam has a valve lift over about 0.420" | ||
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* Bosch HR10BX | * Bosch HR10BX | ||
* Bosch HR9DC | * Bosch HR9DC | ||
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| + | ==Donor vehicles== | ||
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| + | * 1996-2002 Chevrolet Express/GMC Savana full-size vans | ||
| + | * 1996-1999 Chevrolet/GMC C/K full-size trucks | ||
| + | * 1996-1999 Chevrolet Suburban/GMC Suburban full-size long-wheelbase SUVs | ||
| + | * 1996-1999 Chevrolet Tahoe/GMC Yukon full-size short-wheelbase SUVs | ||
| + | * 1999-2000 Cadillac Escalade | ||
==Links== | ==Links== | ||
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