Building an inline 6 Chevy 250 engine

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 Using the earlier head (or one from a 1975-1990 tall deck 292) with the detachable intake from a 194, 230 or 250 cid inline Chevy 6 offers a much better platform. Because of the current lack of aftermarket support for inline Chevy 6 cylinder heads, the hotrodder is left with the removable intake head from the early/mid '70s as the best choice for performance use, unless the cost of a custom head can be justified.
-In the past there were heads made for the Chevy 6. Now there are one-off heads for the Chevy inline 6 that have been made from 2 SBC aftermarket aluminum heads that have been divided and welded back together.
+In the past there were heads made for the Chevy 6. Now there are one-off heads for the Chevy inline 6 that have been made from 2 SBC aftermarket aluminum heads that have been divided and welded back together. Another hybrid cylinder head is usually made from two Vortec 3.0 (181) used in marine or industrial applications - the 3.0 is based on the Chevrolet 153 engine first used in the 1962-67 Chevy II and some 1968-70 Novas (including the Chevrolet/GMC G-series vans (1964-66) and the Jeep DJ-5 (1968-70) used by the United States Postal Service).
 A relatively easy to find head to swap on the 250 inline Chevy is casting number 3864883 from a 194 cid Chevy inline 6 engine. If it's milled 0.060", it will give about 10:1 compression on a Chevy 250 using stock type pistons.

Revision as of 21:30, 2 December 2014