Building an inline 6 Chevy 250 engine
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Beginning in the mid-'70s, the inline 6 Chevy got an integrated intake cylinder head. This was a step in the wrong direction for doing performance mods- the intake being cast as part of the head means it would take too much work to remove it to be able to use any kind of 4-barrel carb. | Beginning in the mid-'70s, the inline 6 Chevy got an integrated intake cylinder head. This was a step in the wrong direction for doing performance mods- the intake being cast as part of the head means it would take too much work to remove it to be able to use any kind of 4-barrel carb. | ||
| − | === | + | ===Intake ports=== |
| − | The Chevy 250 head has a " | + | 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 exhaust flow will help power. A big improvement to the Chevy inline 250 cylinder head is to install an | + | So it comes as no surprise that improving the exhaust flow will help power. A big improvement to the Chevy inline 250 cylinder head is to install an intake port "lump". For years, these was a one-off, hand made piece that was 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] has designed a lump kit and can supply all the necessary tools and info to install it. It is cast and machined pieces of iron that fit into the intake port floors to vastly improve flow. |
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