Vortec L31 cylinder head
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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. | 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. | ||
| − | They are made of cast iron, have | + | 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 30-32 degrees BTDC, or about 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 30-32 degrees BTDC, or about 4-6 degrees less than the earlier non fast burn heads. | ||
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