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CHEVROLET 6 CYLINDER - TECH HIGHLIGHTS

CHEVROLET 6 CYLINDER - TECH HIGHLIGHTS
 

There are two types of six cylinder Chevrolet engines covered in this catalog, the popular V6 and the older inline 6. The inline sixes are found in several oval track racing applications as well as in many street driven cars and trucks. The V6's are found in mini-trucks, Street Rods, and Street Machines, as well as in racing vehicles for various classes of competition. Listed below are the engines covered, and noted are any special requirements for successful modification.

 

230/250 C.I.D. INLINE SIXES

There are two variations of this engine family. The first has the intake manifold cast separately and bolted into the cylinder head. The second type has the intake and head cast together as a single unit. The L2396F piston is used with latter integral intake engines. The removable intake engines can use a V8 piston such as the L2314F or the L2326F provided that critical clearances are checked and that modifications are made as necessary. Compression ratios shown were calculated with a gasket thickness of .038.

 

2.8L V6

This engine is a narrow angle sixty degree V6 design. It's compact size makes it desirable for use in Street Rods as well as in mini-trucks. This package has good potential, but there are some areas which require careful attention in order to insure a successful performance rebuild. Ore common problem is the appearance of coolant in the engine oil. The intake manifold on this engine is prone to coolant leakage if not carefully installed. The engine blocks may also exhibit cracking around the bolt holes. Careful inspection of the block before machining, and strict observance of factory torque specifications are important. Also of note is that many original oil pumps are aluminum, while replacements are cast iron. The difference in materials dictate that a new pickup screen be installed along with the new pump.

 

229 V6

This engine is essentially a 305 V8 with two cylinders removed. If one pays attention to the valve arrangement of each head, many V8 parts can be used to enhance performance. These engines are often seen in a variety of vehicles, and, with parts similarity to the small block V8, have excellent performance potential. The V8 pistons can be reworked to be compatible with the six's heads, and crankshafts can be modified to accept V8 connecting rods for improved durability. In addition, many aftermarket parts are available that will further strengthen these engines for racing use. An .038 thick gasket was used for compression ratio calculation.

 

4.3LV6

This is the "big brother" to the 229, and is based upon the Chevy 350 V8. This is among the largest displacement V6's available, and has excellent potential in high performance applications. Many of the 350's attributes, and parts, are common to this package. While few of these have made their way into the performance market to date, it is only a matter of time until they are seen in Street Rods, and in race vehicles. One particular item to inspect is the oil pump mounting bolt. Two lengths have been used, and they must match the main cap style on the block. Too long a bolt may bind against the main bearing and cause premature failure. A bolt that is too short will not engage enough threads to ensure pump retention.



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