Building an inline 6 Chevy 250 engine
(→Intake manifolds) |
(→Cylinder heads) |
||
| Line 41: | Line 41: | ||
==Cylinder heads== | ==Cylinder heads== | ||
| − | The integrated intake head used with the 250 (except the 292 which retained the separate intake) between 1975-1984 isn't well suited for performance duty. About all that can be done for a head with this intake, is the 1 barrel can be swapped for a 2 barrel by using an adaptor. Integrated intake cylinder heads had one-barrel carburetors until the 1979 model year (the light trucks with the 250 used a Rochester Varajet 2 barrel from 1979-84 which is not performance oriented. Not the hot ticket. The lump port mods along with porting, larger valves, etc. can be done to ANY head, but without the ability to use a high performance intake, these mods would be largely wasted. | + | The integrated intake head used with the 250 (except the 292 which retained the separate intake) between 1975-1984 isn't well suited for performance duty. Some pundits claimed that the integrated cylinder head resulted in increased fuel economy and NVH (noise, vibration, and harshness), its another relic of the malaise era which lasted until late 1984 when the 250 was last optioned with the Chevrolet/GMC truck/van lineup until the 4.3L replaced it. About all that can be done for a head with this intake, is the 1 barrel can be swapped for a 2 barrel by using an adaptor. Integrated intake cylinder heads had one-barrel carburetors until the 1979 model year (the light trucks with the 250 used a Rochester Varajet 2 barrel from 1979-84 which is not performance oriented. Not the hot ticket. The lump port mods along with porting, larger valves, etc. can be done to ANY head, but without the ability to use a high performance intake, these mods would be largely wasted. |
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. | 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. | ||
Your Privacy Choices