| MODEL |
Firebird |
Firebird
Sprint |
Firebird
350 |
Firebird
H.O. |
Firebird
400 |
| Engine - General
|
| Type, no. cyls., valve arr. |
Line, 6, Overhead Cam |
90 degree V. 8, In-Head |
| Bore and stroke (nominal) |
3.8750 3.525
x
3.8774 3.535 |
3.8750 3.746
x
3.8774 3.754 |
4.1200 3.746
x
4.1224 3.754 |
| Piston displcement, cu. in. |
250 |
350 |
400 |
| Bore spacing |
4.4 |
4.62 |
No. System
(front to rear) |
L. Bank |
1-2-3-4-5-6 (In-Line) |
1-3-5-7 |
| R. Bank |
---- |
2-4-6-8 |
| Firing Order |
1-5-3-6-2-4 |
1-8-4-3-6-5-7-2 |
| Compres. ratio (nominal) |
9.0:1 |
10.5:1 |
9.2:1 |
10.5:1 |
10.75:1 |
| Cylinder Head Material |
Alloy Cast Iron |
| Cylinder Block Material |
Alloy Cast Iron |
| Cyl. Sleeve-Wet, dry, none |
None |
Number of
mfg. points |
Front |
2 |
| Rear |
1 |
| Engine installation angle |
3° 35´ |
Taxable horsepower
| Dia^² x No. Cyl. |
| ___________ |
| 2.5 |
|
36.0 |
48.0 |
54.3 |
Publishing max. bhp*
@eng. RPM |
175@
4800 |
215@
5200 |
265@
4600 |
320@
5100 |
330@
4800 |
Publishing max. torque*
lb. ft. @eng. RPM |
240@
2600 |
255@
3800 |
355@
2800 |
380@
3200 |
430@
3300 |
Recommended fuel
regular - premium |
Regular |
Premium |
Rugular |
Premium |
Premium |
| Engine - Pistons
|
| Material |
Aluminum Alloy |
| Description and finish |
Cam Ground Slipper Type - Tin Plated |
| Weight (piston only) oz. |
19.740 - 19.920 |
21.010 - 21.190 |
22.070 - 22.2 |
Clearance
(limits) |
Top land |
0.024 - 0.029 |
0.017 - 0.02 |
| Skirt Top |
0.0022 - 0.0028 (a) |
0.0025 - 0.0031 |
| Skirt Bottom |
0.0017 - 0.0033 |
0.0020 - 0.003 |
| Weight (piston only) oz. |
19.740 - 19.920 |
21.010 - 21.190 |
22.070 - 22.2 |
Ring groove
depth |
No. 1 ring |
3.427 - 3.437 |
3.667 - 3.67 |
| No. 2 ring |
3.427 - 3.437 |
3.667 - 3.67 |
| No. 3 ring |
3.446 - 3.456 |
3.670 -3.68 |
| No. 4 ring |
None |
(a) Pistons selected for clearance at 1.110 below top of piston.
|
| MODEL |
Firebird
250 cu. in. Engines |
Firebird
350 cu. in. Engines |
Firebird
400 cu. in. Engines |
| Engine - Rings
|
Function
(top to bottom) |
No. 1, oil or comp. |
Compression |
| No. 2, oil or comp. |
Compression |
| No. 3, oil or comp. |
Oil |
| No. 4, oil or comp. |
None |
| Compression |
Description -
material, coating,
etc. |
Cast Iron Reverse Twist With - |
| (a) or (b) |
(c) or #1 and #2 Taper Face
Moly Channel |
#1 and #2 Taper Face
Moly Channel |
| Width |
0.0778 |
No. 1 0.0778 No. 2 0.0775 |
| Gap |
0.015 |
0.19 |
| Oil |
Description -
material, coating,
etc. |
Multi-Piece (2 Rails and 1 Expander)
Rails: Steel with Chrome Plated O. D.
Expander: Stainless Steel |
| Width |
0.186 |
| Gap |
0.035 |
| Expanders |
In Oil Ring Assembly |
| Engine - Piston Pins
|
| Material |
SAE 5015 |
SAE 1016 |
| Length |
3.00 |
3.25 |
| Diameter |
0.9272 |
0.9802 |
| Type |
Locked in rod, in
piston, floating, etc. |
Locked in Rod |
| Busing - In rod or piston |
None |
| Busing - Material |
None |
| Clearance |
In piston |
0.0003 - 0.0005 |
0.0005 - 0.0007 |
| In rod |
Press Fit |
| Direction and amount offset in piston |
To Right - 0.063 |
| Engine - Connecting Rods
|
| Material |
SAE 1037, 1038
or 1141 |
Arma Steel |
| Weight (oz.) |
23.9 |
31.7 |
| Length (center to center) |
5.70 |
6.625 |
| Bearing |
Material and Type |
Moraine 100-A (d)(e)(f) |
Moraine
400-A (d) |
| Overall Length |
0.837 |
0.88 |
| Clearance (limits) |
0.0007 - 0.0027 (g) |
0.0005 - 0.0025 |
0.0005 - 0.0026 |
| End play |
0.0085 - 0.0135 |
0.006 - 0.011 (Total for Two) |
(a) 250 1 bbl. Engine: #1 - Barrel Face Moly Channel, #2 - Barrel Face Tin Plated
(b) 250 4 bbl. Engine: #1 - Barrel Face Moly Channel, #2 - Taper Face Moly Channel
(c) 350 2 bbl. Engine: #1 - Taper Face Moly Channel, #2 - Taper Face Tin Plated
(d) Steel backed removable precision
(e) Moraine 400-A on 4 bbl. 250 cu. in. engines
(f) Moraine 400-A on 4 bbl. 350 cu. in. engines
(g) 0.0007 - 0.0028 on 4 bbl. 250 cu. in. engines
|
| MODEL |
Firebird
250 cu. in. Engines |
Firebird
350 cu. in. Engines |
Firebird
400 cu. in. Engines |
| Engine - Crankshaft
|
| Material |
Nodular Iron (d) |
| Vibration damper type |
Rubber Floated Weight |
| End thrust taken by bearing (No.) |
7 |
4 |
| Crankshaft end play |
0.002 - 0.006 |
0.0035 - 0.0085 |
Main
bearing |
Material and type |
Durex 100-A* Steel Backed, Removable, Precision (b) |
| Clearance |
0.0003 - 0.0019 |
0.0002 - 0.0017 (c) |
Journal
dia. and
bearing
overall
length |
No. 1 |
2.30 x 0.80 |
3.00 x 0.94 |
| No. 2 |
2.30 x 0.80 |
3.00 x 0.94 |
| No. 3 |
2.30 x 0.80 |
3.00 x 0.94 |
| No. 4 |
2.30 x 0.80 |
3.00 x 1.13 |
| No. 5 |
2.30 x 0.80 |
3.00 x 1.59 |
| No. 6 |
2.30 x 0.80 |
None |
| No. 7 |
2.30 x 1.01 |
None |
| Dir. and amt. cyl. offset |
None |
| Crankpin journal diameter |
2.00 |
2.25 |
*M-400 in lower half of No. 1,2,3, and 4 locations of 4 bbl. 450 cu. in. and 400 cu. in.
(a) Neoprene with fibre glass cord reinforcement
(b) M-400 in all locations of option 6 cylinder 4 bbl. engine
(c) 0.0012 - 0.0028 on Ram Air II Engine option
(d) Arma Steel on Ram Air II engine option
|
| Engine - Camshaft
|
| Location |
Overhead |
Between Cylinder Banks |
| Material |
Hardened Alloy Cast Iron |
| Bearings |
Material |
Aluminum Alloy |
Hight Lead Baffit on Steel |
| Number |
7 |
5 |
Type of
Drive |
Gear or chain |
Belt (a) |
Chain |
Crankshaft gear or
sprocket material |
Hardened Cast Iron |
Carburized and Hardened Steel |
Camshaft gear or
sprocket material |
Hardened Cast Iron |
Aluminum Alloy with Nylon Covered |
| Timing Chain |
No. of links |
98 Teeth |
60 |
| Width |
1.031 - 0.954 |
0.88 (Morse) - 1.00 (Link be) |
| Pitch |
0.500 |
0.375 |
(a) Neoprene with fibre glass cord reinforcement
|
| Engine - Valve System
|
| Hydraulic lifters (Std., opt, NA |
Standard |
Valves rotator, type
(intake, exhaust) |
None |
| Rocker ratio |
1.5:1 |
Operating
tappet
clearance
(indicate hot or cold) |
Intake |
0 |
| Exhaust |
0 |
| MODEL |
Firebird |
Firebird
Sprint |
Firebird
350 |
Firebird
H.O. |
Firebird
400 |
| Engine - Lubrication System
|
Type of
lubrication
(splash,
pressure,
nozzle |
Main bearings |
Pressure |
| Connecting rods |
Pressure |
| Piston pins |
Splash |
| Camshaft bearings |
Pressure |
| Tappets |
Pressure |
| Timing gear or chain |
Metered Jet |
| Cylinder walls |
Metered Jet |
| Oil pump type |
Spur Gear |
| Normal oil pressure (lb. engine rpm) |
26 - 36 # 2800 RPM |
30 - 40 above 2600 RPM |
55 - 60 above 2600 RPM |
| Oil press. sending unit (elect. or mech.) |
Electric |
| Type oil intake (floating, stationary) |
Stationary Screen |
| Oil filter system (full flow, part., other) |
Full Flow |
| Filter replacement (element, complete) |
Complete |
| Capacity of c case, less filter-refill (qt.) |
5 |
Oil grade recommended (SAE viscosity
and temperature range) |
| Anticipated Lowest Temp. |
Single Viscosity
SAE Number |
Acceptable
Alternate |
|
|
|
| Above Freezing (+32°F.) |
20 W |
10W - 30 |
| Below Freezing (+0°F. to +32°F.) |
10 W |
10W - 30 |
| Below Zero |
5 W |
5W - 20 |
|
| Engine Service Reqmt. (MM, MS, etc) |
MS |
| Engine - Exhaust System
|
TYPE (single, single with cross-over,
dual, other) |
Single (a) |
Dual |
Muffler No. and type (reverse flow,
straight thru, separate resonator |
One - Reverse Flow |
(b) |
One - Reverse Crossflow with Dual Inlets and Outlets (g) |
Exhaust pipe dia.
(O.D., wall thick.) |
Branch |
None (c) |
2.00 x 0.060 |
None |
Not Used |
| Main |
2.00 x 0.060 |
2.25 x (d) |
2.25 x 0.070 |
2.25 x 0.060 |
Front: 2.00 x 0.060 (h) Rear 2.25 x 0.070 |
| Tail pipe dia. (O.D. and wall thickness) |
Muffler Outlet Spout (or Spouts) 2.00 x 0.060 |
2.00 x 0.060 Muffler Outlet Spouts |
(a) Dual system standard on H.O., Y pipe joins dual outlet manifold to single exhaust pipe on Sprint, Crossover pipe used on 350.
(b) One crossflow muffler with dual inlets and outlets, reverse flow resonator ahead of muffler in each pipe on dual systems.
(c) Sprint Y pipe legs 2.00 x 0.060.
(d) 0.076 - front section, 0.070 - rear section.
(e) Front section, 2.25 x 0.070 rear section.
(f) Except 350 HO engine which is same as Firebird 400 H.O.
(g) Reverse flow resonator ahead of muffler in each pipe.
(h) 2.25 x 0.076 with H.O. and Ram Air IV options.
|
| Engine - Crankcase Ventilation System
|
| Type (ventilates to atmos., induction system, other) |
Standard |
Induction System |
| Optional |
None |
| Control Unit |
Make and model |
AC Type CV-735C |
AC Type CV-679C |
| Location |
Intake Manifold |
Push Rod Cover |
| Energy source (manifold vacuum, carburetor air stream, other) |
Manifold Vacuum |
| Control method (variable orifice, fixed orifice, other) |
Variable Orifice |
Complete
system |
Discharges (to intake manifold, carb. air intake, air cleaner intake, other) |
Intake Manifold |
| Air inlet (breather cap, carburetor air cleaner, other) |
Through Filter in the Carburetor Air Cleaner |
| Flame arrestor (screen, check valve, other) |
Check Valve |
| MODEL |
Firebird |
Firebird
Sprint |
Firebird
350 |
Firebird
H.O. |
Firebird
400 |
| Engine - Fuel System
|
| |
6 Cyl. Engines |
V-8 Engines |
Induction type: Carburetor, fuel
injection, supercharger. |
Carburetor |
Fuel
Tank |
Refill capacity (U.S. gals.) |
18.5 |
| Filler location |
Center Rear |
Fuel
Pump |
Type (elec. or mech.) |
Mechanical |
| Locations |
Right Front of Engine |
Left Front of Engine |
| Pressure range |
4.0 - 5.5 |
5.0 - 6.5 |
| Vacuum booster (std., optional, none) |
None |
Fuel
Filter |
Type |
Plastic Fabric in Fuel Tank and Sintered |
| Locations |
Bronze in Carburetor Inlet (a) |
Carbure-
tor |
Choke Type |
Automatic |
Intake manifold heat control
(exhaust or water) |
Exhaust |
Air cleaner
type (d) |
Standard |
Air Wetted Paper |
| Optional |
Two Stage - Wetted Plastic Foam Over Paper Element |
Idle speed (spec.
neutral or drive)
N. D. |
Manual N. |
700 |
800 |
700 |
850 |
850* |
| Automatic D. |
600 |
600 |
600 |
650 |
650* |
| Idle A F mix. |
|
(a) Pleated paper instead of sintered bronze in the 1-bble. carb. for manual transmissions and all 4-bbl. carburetors.
**1000 With Ram Air Option
|
| Engine - Cooling System
|
| Type system (pressure, pressure vented, atmospheric, other) |
Pressure Vented |
| Radiator cap relief valve pressure |
14-17 P.S.I. |
Circula-
tion
thermostat |
Type (choke, bypass) |
Choke |
| Starts to open at (°F) |
190° |
Water
Pump |
Type (centrifugal, other) |
Centrifugal |
| GPM 1000 pump rpm |
16 |
17 |
| Number of pumps |
One |
| Drive (V-belt, other) |
V-Belt |
| Bearing type |
Sealed Ball Bearing |
| Bypass recirculation type (inter., ext.) |
External |
Integral |
Radiator core type
(cellular, tube and fin, other) |
Tube and Center |
Cooling
system
capacity |
With heater (qt.) |
12.1 |
18.6(350) |
17.8 (400) |
| Without heater (qt.) |
Heater Standard Equipment |
| Opt. equipment-specify (qt.) |
12.7 w/Air Cond. |
20.2 (350), 19.4 (400) with A/C |
| Water jackets full length of cyl.(yes,no) |
Yes |
| Water all around cylinder (yes,no) |
Yes |
Radiator
hose |
Lower |
Number and type
(molded, straight) |
One, Molded |
| Inside diameter |
1.75 |
| Upper |
Number and type
(molded, straight) |
One, Molded |
| Inside diameter |
1.50 |
| By-pass |
Number and type
(molded, straight) |
One - External |
One - Internal |
| Inside diameter |
5/16 |
Hose Not Used |
| Fan |
Number of blades and spacing |
4 - 76° & 104° (a) (b) |
| Diameter |
17.62 |
19.0 |
| Ratio-fan to crankshaft rev. |
.95:1 (1.08:1 with A/C) |
.91:1(1.25:1 with A/C |
| Fan cutout type |
Fluid Clutch-Thermostatically Controlled V-8 (A/C Only) |
| Bearing type |
See Water Pump |
*Drive
belts
(indicate
belt used
by letter |
Fan |
| A |
| |
A,B |
| |
A,C |
| |
B,C |
| A |
| |
A,B |
| |
A |
| |
B,D |
| A |
| |
A,B |
| |
A,C |
| |
B,C |
| |
| |
B |
| |
|
| |
B,D |
| |
| |
|
| |
C |
| |
C |
|
| E |
| |
F,G |
| |
E |
| |
F,I |
| |
| E |
| |
F |
| |
E |
| |
F |
| |
| E |
| |
F,G |
| |
E |
| |
F,I |
| |
| |
| |
G |
| |
|
| |
I |
| |
| |
| |
|
| |
H |
| |
H |
| |
|
| Generator-alternator |
| Water pump |
| Power Steering |
| Air Conditioning |
| NOTES:
|
(a) 7 blade 18 dia. PoWer-Flex fan on 6 cyl. with A/C.
(b) 7 blade 19.5 dia. fan on all V-8 with A/C - 5 blade 19 dia. Power-Flex std. on 400 V-8
except std. 4 blade fan used with Ram Air Option.
|
Drive Belt Dimensions
|
| * Drive Belt Dimensions |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
K |
| Angle of V |
36° |
36° |
36° |
36° |
36° |
36° |
36° |
36° |
36° |
|
|
| Nominal Length(SAE) |
39.0 |
51.5 |
58.0 |
27.6 |
54.0 |
50.0 |
52.0 |
59.0 |
53.5 |
|
|
| Width |
.38 |
.47 |
.47 |
.38 |
.38 |
.38 |
.47 |
.47 |
.47 |
|
|
|
