Performance Big Block Bare Block
A Better Big-Block
The classic Chevy Big-Block production engine was
introduced in 1965. In the late 1980s, a new version
arrived, designed for marine and fuel-injected applications.
The early-style engines are known as Mark IV Big-Blocks,
while the later style is referred to as the Gen V (and Gen
VI) Big-Block. You can tell them at a glance by checking for
a mechanical fuel pump mounting pad. If it has one, it's a
Mark IV. If there's no fuel pump pad, it's a Gen V block.
Despite the fuel pump mounting pad difference in their
castings, the cylinder blocks of the Mark IV and Gen V are
based on the same design architecture. There are several
other differences?particularly in the water jackets near the
deck surfaces?that make some Mark IV and Gen V parts
incompatible, including crucial components such as the
cylinder head gaskets.
Within the last few years, Chevrolet Performance revised
the basic Big-Block architecture to commonize the Mark IV
and Gen V, creating an all-new cylinder block casting that
combines the features of both generations. It also incorporates
significant updates and strength-enhancing features that make
the Big-Block a stronger engine foundation with provisions to
support 21st-century performance.
Although the basic Big-Block architecture is revised,
Chevrolet Performance continues to offer two versions,
each differentiated by performance and displacement
capability. The Bowtie block continues to be the block of
maximum performance. All of our crate engines use the
revised Big-Block design.
Specifications:
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.