Chevrolet 1963 Corvette, Руководство по ремонту и настройке, Страница: 102 / 346

96 ENGINE AND ENGINE REBUILDING
Torque Specifications
All readings are given in ft. Ibs.
Manifold
Year
Engine
Displace-
ment (cu
in.)
Cylinder
Head Bolls
Connecting
Rod Cap Bolts
Main
Bearing
Cap Bolts
Crankshaft
Balancer
Bolts
Flywtieel-To-
Crankshaft
Bolts
Intake
Exhaust
1 9 6 3 - 6 7
327
6 0 - 7 0
35 80 60® 60 30
18-22
1 9 6 8 - 7 6 327, 350 6 0 - 7 0
45 75® 60® 60 30
18-22
1 9 7 7 - 8 4 305, 350 65 45 80® 60 60 30® 20®
1965 396 80 50 115 85 65 30 20
1 9 6 6 - 7 6 427, 454 80® 50® 1 0 0 ® 85 65 30 20
© Aluminum heads—short bolts 65; long bolts 75
® Engines with 4-bolt mains—outer bolts 65
® Engines with 4-bolt mains—short bolts 95; long bolts 105
®
7
/16
©Where applicable
©Outer bolts—High Pert.—70ft. Ibs.
® Inboard bolts—30 ft. Ibs.
©Also torque the throttle body plate bolts to 20-34 ft. Ibs. (1982 only)
have been offered in six internal displace-
ments and approximately 14 performance
levels.
Induction systems for these engines are
varied and range from a single four-barrel
configuration to "Tri-Power" (three Holley
two-barrels), Rochester fuel injection, and the
new "Cross-Fire Injection" which consists of
two opposed throttle body fuel injection units.
The 327 cubic inch V8 was offered from
1963 through 1968 and spanned a horse-
power range of 250 to 375; the latter figure
being obtained with fuel injection. The 327,
in addition to fuel injection, has used the
Carter WCFB and AFB, Holley, and Ro-
chester Quadrajet carburetors.
The stroke of the 327 was lengthened in
1969 and this brought the displacement to 350
cu in. The 350 as found in the 1969 through
1979 Corvettes has been available in horse
power ratings from 165 to 370. It is offered
with either a single, four-barrel Rochester or
Holley carburetor. The 305 engine used in
1980 California Corvettes only, has the same
stroke as a 350 but the cylinder bore is a
smaller 3.736". The 305, 327 and 350 engines
are collectively referred to as the small block
Corvette engines.
The 327 engine was derived from the ear-
lier 265 and 283 Corvette engines, but fea-
tured many improvements. The block was a
completely new casting and provided stronger
main bearing webs. The bottom ends of the
cylinders were relieved to clear the longer
stroke crankshaft. All 327 and 350 cubic inch
engines, except base power plants, are
equipped with forged crankshafts. Main
bearing diameters were increased from 2.30
to 2.45 inches in 1968.
The large block engines were introduced
to provide more torque and more flexible
horsepower than the peakier small blocks.
The cylinder block is quite conventional, the
heads are where the innovation lies. Intake
and exhaust valves are canted away from each
other for optimum gas flow and port config-
uration. The seemingly strange angles at
which the valves point gave rise to the nick-
name of "Porcupine" which was applied to
these heads when they first appeared on
NASCAR racing Chevrolets in 1963.
The large block Corvette engine was intro-
duced in 1965 with an initial offering of 396
cubic inches and 425 hp. The 396 was en-
larged to 427 cubic inches with a bore in-
crease in 1966, although the top rated horse-
power remained at 425. The 427, optional
from 1966 through 1969, was offered in 390,
400, 425, 430, and 435 horsepower versions.
Carburetors used on the large blocks in-
cluded four-barrel Holley and Rochester car-
buretors and three, two-barrel carburetors.
The 427 received a stroke increase in 1970
and became the 454. The "big-block" reached
its highest performance rating in 1970 with
horsepower output listed at 460 for the rare
LS7 engine. Details are scarce as to whether
this engine was ever installed in a production
vehicle.
Generally speaking, the small and large
block Corvette engines are of the same basic
design. They feature eight cylinders ar-