Building an inline 6 Chevy 250 engine
(→Parts suppliers: format link) |
(Add text; format images) |
||
| Line 13: | Line 13: | ||
==Cylinder heads== | ==Cylinder heads== | ||
| − | + | ===Exhaust ports=== | |
| + | The Chevy 250 head has a "4-port" exhaust. That means two ports are siamesed and two are 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 exhaust 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 and can supply all the necessary tools and info to install it. It is a cast and machined piece of iron that fits into the exhaust port floor to vastly improve flow. | |
| − | + | ||
| − | [ | + | |
| − | + | ||
| − | + | ||
| + | {| | ||
| + | |[[File:Milling boss for lump port mod.jpg|thumb|300px|left|Milling of boss just started]] | ||
| + | |[[File:Boss nearly gone lump port.jpg|thumb|360px|left|Boss nearly gone]] | ||
| + | |} | ||
| + | {| | ||
| + | |[[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]] | ||
| + | |} | ||
| + | |||
| + | |||
| + | <br style="clear:both"/> | ||
|thumb|350px|left| | |thumb|350px|left| | ||
|thumb|350px|left| | |thumb|350px|left| | ||
Your Privacy Choices