Building an inline 6 Chevy 250 engine
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(→Intake port mods) |
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The Chevy 250 head has a "3-port" intake. That means two ports are siamesed into a single port. This design, while fine for a daily driver or truck, leaves a lot to be desired for high performance work. | The Chevy 250 head has a "3-port" intake. That means two ports are siamesed into a single port. This design, while fine for a daily driver or truck, leaves a lot to be desired for high performance work. | ||
| − | So it comes as no surprise that improving the intake port flow will help power. A big improvement to the Chevy inline 250 cylinder head is to install an intake port "lump". For years, these were one-off, hand-made pieces that were quite a chore to fabricate and mount. Some were better than others, and some were worse than nothing. Nowadays, [http://t6racing.org/index.html T6 Racing] and [http://www.12bolt.com/home | + | So it comes as no surprise that improving the intake port flow will help power. A big improvement to the Chevy inline 250 cylinder head is to install an intake port "lump". For years, these were one-off, hand-made pieces that were quite a chore to fabricate and mount. Some were better than others, and some were worse than nothing. Nowadays, [http://t6racing.org/index.html T6 Racing] and [http://www.12bolt.com/home 12Bolt] have designed a lump kit and can supply all the necessary tools and info to install it. It is cast and machined pieces of metal that fit onto the intake port floors to vastly improve flow. |
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|[[File:Top lump port w arrows.jpg|thumb|370px|left|Arrowed area has to be blended away]] | |[[File:Top lump port w arrows.jpg|thumb|370px|left|Arrowed area has to be blended away]] | ||
|[[File:Cutaway lump in port.jpg|thumb|290px|left|Cutaway showing lump in port]] | |[[File:Cutaway lump in port.jpg|thumb|290px|left|Cutaway showing lump in port]] | ||
| − | |} | + | |} |
===Head torque specs=== | ===Head torque specs=== | ||
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