Building an inline 6 Chevy 250 engine
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==Introduction== | ==Introduction== | ||
The Chevy inline 6 has been around in one version or another since 1929 until 1988 in domestic vehicles. The Chevy straight 6 250 cid engine was brought out in 1966. It has a 0.280" longer stroke (3.53") and the same bore (3.875") as the 230 cid straight 6. It boasts a 7 main bearing bottom end- quite an improvement over the previous generation inline's 4 main bearings. | The Chevy inline 6 has been around in one version or another since 1929 until 1988 in domestic vehicles. The Chevy straight 6 250 cid engine was brought out in 1966. It has a 0.280" longer stroke (3.53") and the same bore (3.875") as the 230 cid straight 6. It boasts a 7 main bearing bottom end- quite an improvement over the previous generation inline's 4 main bearings. | ||
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==Engine ID== | ==Engine ID== | ||
| − | Obviously casting numbers and VIN stampings can be a big help. See '''[[Building a Chevy 250 engine#Resources|below]]''' under Resources for a few sites that have | + | Obviously casting numbers and VIN stampings can be a big help. Chevy inline 6 casting numbers can usually be found just above the starter on the passenger side of the block. |
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| + | See '''[[Building a Chevy 250 engine#Resources|below]]''' under '''Resources''' for a few sites that have casting number info. | ||
[[File:Vin stamp.jpg|thumb|300px|Location of VIN/application code stamping for 1962 and newer engines]] | [[File:Vin stamp.jpg|thumb|300px|Location of VIN/application code stamping for 1962 and newer engines]] | ||
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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 Autowerks] 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. | 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 Autowerks] 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. | ||
| + | {| | ||
| + | |[[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]] | ||
| + | |} | ||
==Intake manifolds== | ==Intake manifolds== | ||
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Using the earlier head with the detachable intake from a 230 or 250 inline Chevy 6 offers a much better platform. | Using the earlier head with the detachable intake from a 230 or 250 inline Chevy 6 offers a much better platform. | ||
| − | [[File:4bbl inline int.jpg|thumb|350px| | + | {| |
| − | + | |[[File:Offy intake.jpg|thumb|350px|center|Offenhauser 3 x 1 barrel aluminum intake for the Chevy inline 6]] | |
| + | |[[File:4bbl inline int.jpg|thumb|350px|center|4-barrel inline 6 intake]] | ||
| + | |} | ||
==Exhaust== | ==Exhaust== | ||
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:[http://www.1954advance-design.com/Stovebolt-engine/casting-numbers.html 1929-'62 numbers], from 1954advancedesign.com | :[http://www.1954advance-design.com/Stovebolt-engine/casting-numbers.html 1929-'62 numbers], from 1954advancedesign.com | ||
:[http://www.novaresource.org/codes.htm Engine codes], from NovaResource.com | :[http://www.novaresource.org/codes.htm Engine codes], from NovaResource.com | ||
| + | :[http://www.adchevy.com/tools/castinglookup/ Casting number look up tool] and link to c/n lists from adchevy.com. | ||
'''[[Building a Chevy 250 engine#Engine ID|Return to top]].''' | '''[[Building a Chevy 250 engine#Engine ID|Return to top]].''' | ||
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