Building an inline 6 Chevy 250 engine
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The Chevy inline 6 uses a pair of gears and no chain to turn the camshaft. There are high performance gear sets available from Comp and others. The cam gear on aftermarket performance timing sets is often aluminum. | The Chevy inline 6 uses a pair of gears and no chain to turn the camshaft. There are high performance gear sets available from Comp and others. The cam gear on aftermarket performance timing sets is often aluminum. | ||
| − | + | ==Exhaust manifolds== | |
| − | In the past, | + | In the past, a stock single outlet exhaust manifold was "split" to run two exhaust pipes from the manifold. This helped performance somewhat. Eventually the aftermarket came out with manifolds made for the inline Chevy. |
| − | [[File:Exhaust ciron.jpg|thumb|350px|left|]] <br style="clear:both"/> | + | The closest thing to a factory high performance exhaust manifold would be the 1966-'69 Pontiac OHC Sprint engine's split manifold. This was actually a nice piece, but the OE exhaust pipes were pinched where they came together, creating a restriction (see photo below). If this was removed by running dual round exhaust pipes from the flanges back, they worked very well. A distant second to the Sprint exhaust manifold is the 1967-'74 292 exhaust manifold with a 2.5" outlet from a heavy duty application (large truck/bus). |
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| + | [[File:Sprint exh side view.jpg|thumb|350px|left|Pontiac OHC Sprint engine]] | ||
| + | [[File:Exhaust ciron.jpg|thumb|350px|left|Aftermarket cast iron exhaust manifold]] <br style="clear:both"/> | ||
===Headers=== | ===Headers=== | ||
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