How many cylinders does a big block Chevy have?
- total performance
- Sep 8, 2022
- 2 min read
The large block has gone through a wide range of different manufacturing cylinder head changes throughout the years. The early heads used what is now known as a closed combustion chamber and were made of both cast iron and aluminum. By 1970, second-generation heads had been endowed with a bigger, open chamber structure that permitted up to 2.250-/1.88-inch valves. The tight chambers had hidden the tiny valves.
While the size and structure of the combustion chamber are significant, most enthusiasts tend to pay more attention to the design of the intake ports. In this case, Chevrolet provided two options: oval and rectangular. Rectangular port heads were saved for performance engines, whereas oval port heads were intended for basic engine packages. Due to their tiny inlet opening, later engines for heavy-duty trucks were equipped with what is today known as "peanut port heads."
The casting number 353049 variants The open-chamber heads of the iron oval port are the finest; these heads may produce tremendous power when modified with bigger 2.25-/1.88-inch valves and minor port work. Of course, their enormous weight is a drawback. Most people looking for performance will choose one of several aluminum heads aftermarket, including those made by Dart. Almost every application may be accommodated by a variety of combinations for the intake runner, valve, chamber, and valve spring.
The main issues with interchangeability are chamber and piston compatibility and making sure the compression ratio is appropriate for your needs. One issue to bear in mind is that a piston engine with a domed, open chamber cannot employ closed chamber heads since the dome will physically strike the head. With a flat top or dished piston, this isn't an issue, but with domed pistons, it's a strict requirement. On the other hand, open chamber heads may be installed without hindrance in a closed-chamber, domed piston engine.
If not matched appropriately, the variation in chamber size might cause the compression to move in an unexpected direction. For instance, the roughly 10cc bigger chamber of a short-stroke engine might cause the compression ratio to be drastically reduced if 454 open-chamber heads in a set were installed on a 396.
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