Engine Mechanical; Six Cylinder Engine; Tempest And Firebird Engines; Pontiac And G. P. Engine Chart - Pontiac Grand Prix Service Manual

ENGINE MECHANICAL
SIX CYLINDER ENGINE
V-8 ENGINE
GENERAL DESCRIPTION
cylinder heads, camshaft and valve train specifically
for the Ram-Air engine.
TEMPEST AND FIREBIRD ENGINES
Thirty-one different engine transmission combinations
are available. These combinations and their usages are
The Pontiac Tempest and Firebird uses a 250 cubic shown on the engine chart (Figs. 6-2 and 6-3).
inch inline overhead camshaft six-cylinder engine as
standard equipment. This engine has a 3 7/8" bore
Engine identification is facilitated by a letter code
and 3 17/32" stroke'with a compression ratio of 9.0:l.
stamped below the production engine serial number
An optional overhead camshaft engine equipped with
on V-8 engines (Fig. 6-5). The code is stamped on the
a four-barrel carburetor has a compression ratio of
block in front of the right bank of cylinders. The
10.5: 1 with the same bore and stroke.
engine code for 6-cylinder engines is stamped on the
cylinder head contact surface of the block behind" the
Six optional V-8 engines are available on special order,
oil filler pipe (Fig. 6-4). By referring to the identifica-
two having 350 cubic inch displacement with 3 7/8"
tion code and the engine chart, each engine may be
bore and 3 3/4" stroke. The compression ratios are
readily identified.
9.2:l and 10.5:l. Four 400 cubic inch displacement
engines available in the G.T.O. have a 4.120" bore The vehicle identification number is stamped on the
and 3 3/4" stroke. These engines have compression right rear lower side of t t e six-cylinder engine block
ratios of 8.6:l and 10.75:l. One of these engines is for and to the right of the timing chain cover on V-8
use in Ram-Air cars only and incorporates block, engines (Fig. 6-6).
PONTIAC and G.P. ENGINE CHART
I
(4
(4
G.P.
G.P.
G.P.
G.P.
G.P.
G.P.
G.P.
Fig. 6-1 Pontiac and G. P. Engine Chart