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. For years, these were one-off, hand-made pieces that were quite a chore to fabricate and mount. On the block there will be foundry ID codes, for instance "CON3". Dianna - Teaching Upper Elem. Not only will the results be very humbling, but the amount of money that would need to be spent in order to go toe-to-toe with a SBC 350 will break most people's budget all to hell. The Chevy straight 6 250 c.i.d. Two transmissions. Besides the obvious differences, they share practically no parts w/the V8 engines (save for the oil filter (AC Delco PF25 or equivalent) and some of the valve train (the rocker arms do not interchange with the Chevrolet V8 (all series). He now offers ported cast iron heads and other parts. Parts aren't as common for the inline 250 as they are for a SBC, but there is info and quite a few suppliers for parts, as well as places that cater to almost nothing but the Chevy inline 6 engines. Just goes to show you what can be done with enough skill, tools, time and dedication. If making all the power possible is the goal, an intake without hot water heating would be the better choice. number stamped in a separate string of numbers near the suffix string. Rob Wagner is a journalist with over 35 years experience reporting and editing for newspapers and magazines. In '71-'72 you could get an SS with either a big-block or small-block. If the block is missing the suffix and partial V.I.N., there's no way to know what the engine might have come in originally, unless there were other external clues like a carb w/a governor on it (would be on a heavy truck or bus), or if it had a large bell-housing and a HD "granny low" trans (also HD truck/bus application). The engine date must precede the car build date, otherwise something is amiss. Chevrolet Inline Six-Cylinder Power Manual 2nd Edition, 1962-up head casting numbers/chamber sizes, Chevrolet and GMC inline / straight 6 engines: Guides and resources, https://www.crankshaftcoalition.com/wiki/index.php?title=Building_an_inline_6_Chevy_250_engine&oldid=3476583. One of the best carbs for a warmed-over 250 Chevy 6 is the 390 cfm Holley 4 barrel. NSN-TRI..1963 Corvette Split Window Coupe Export RH Drive Z06 Fuelie GM Show Car 327-360 hp 4 speed with 22,723 actual miles. There may be a date code cast into the block. Light duty trucks c. 1978 - 1984 will have casting 14015499 (this one has the Varajet carburetor base - integrated intake runners are curved and incorporate a dual outlet exhaust manifold). I think all big-blocks from '68-'71 sold in California came with smog pumps. Although production ceased in 1990 for automotive use, the inline six (including its four cylinder variant still in production as the Vortec 3000 marine/industrial motor) was produced overseas in Latin America for Brazilian-market GM products until the 2001 model year. It is cast and machined pieces of metal that fit onto the intake port floors to vastly improve flow. The inline Chevy 250 was equipped with several different carbs through the years, from a single 1 barrel carb to a staged 2 barrel Rochester VaraJet carb. The Chevy small block 327-cubic-inch V-8 engine can be identified by its engine code stamping numbers. The Chevy 250 head has a "3-port" intake. Superchargers can also be used, but the turbo is the preference of many who are going for boost. This was a step in the wrong direction for a performance engine- the intake being cast as part of the head means it would take too much work to remove it to be able to use any kind of 4-barrel carb. The big and small block engine types are almost identical, with the big block having a higher deck than the small block. One drawback is the uneven fuel mixture with the stock one barrel carburetor where the front and rear cylinders have an uneven fuel distribution.

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