Engine Specifications
ENGINE SUMMARY
Make | Pontiac |
Displacement - Advertised | 400 |
Layout | V |
Cylinders | 8 |
Year | 1970 |
Model | Ram Air IV |
Description | Eng code WH, Man trans |
Stock/Modified | Stock OE |
Builder | Pontiac |
HP Advertised | 370 |
RPM@HP Advertised | 5500 |
Bore | 4.12 |
Stroke | 3.75 |
Rod Length | 6.625 |
Bore/Stroke Ratio | 1.099 |
Rod/Stroke Ratio | 1.767 |
Compression Ratio | 10.5 |
Bore Angle | 90 |
Firing Order | 1-8-4-3-6-5-7-2 |
Rotation (from front) | CW |
Notes | Test RA IV engine |
SHORT BLOCK
Block: | |
Manufacturer | Pontiac |
Part Number | 9799915 |
Description | 1970 400 Ram Air IV |
Deck Height | 10.24000 |
Bore Spacing | 4.62000 |
Material | Iron |
Main Caps | 4 bolt |
Weight | 202.000 |
Notes | Test RA IV block |
CRANKSHAFT:
Crankshaft: | |
Manufacturer | Pontiac |
Part Number | 9794054 |
Description | Test RA IV crank |
Stroke | 3.750000 |
Main Journal Dia | 3.000000 |
Rod Journal Dia | 2.250000 |
Design | 90 deg |
Material | Nodular Iron |
Weight | 70.000 |
Notes | WH, WW, XN, XP engines, 0.001 more clearance. |
CONNECTING RODS
Connecting Rods: | |
Manufacturer | Pontiac |
Part Number | 541000 |
Description | generic cast V8 |
Length | 6.62500 |
Big End Bore Dia | 2.37400 |
Pin Bore Dia | 0.98000 |
Big End Width | 0.99600 |
Pin End Width | 1.05000 |
Crank Pin Dia | 2.25000 |
Wrist Pin Dia | 0.98000 |
Design | I-Beam |
Construction | Cast |
Material | Iron |
Fasteners | 3/8" |
Weight, Total | 900.000 |
Weight, Big End | 450.000 |
Weight, Small End | 350.000 |
Weight, Bearings End | 33.000 |
Notes | test rod |
Pistons:
Pistons: | |
Manufacturer | Pontiac |
Part Number | 646416416 |
Description | 400 Ram Air 4 '70 |
Compression Height | 1.72000 |
Dome Volume | -8.000 |
Crevice Volume Included | yes |
Top Land Dia | 4.05000 |
Top Land Depth | 0.22300 |
Construction | Forged |
Material | aluminum |
Skirt Style | full |
Skirt Coating | none |
Top Coating | none |
Pin Dia | 0.980000 |
Pin Bore Dia | 0.980200 |
Pin Length | 3.06000 |
Pin Retention | Pressed |
Weight | 562.000 |
Ring Tension | 25.000 |
Ring Leakage | 3.000 |
Ring Package Weight | 29.000 |
Pin Weight (incl retainer) | 125.000 |
Notes | test ra iv piston |
Oil System:
Oil System: | |
Type | Stock Wet Sump |
CYLINDER HEADS
Cylinder Head - Design: | |
Manufacturer | Pontiac |
Part Number | 65464135 |
Description | '70 Ram Air IV |
Porting Level | None |
Chamber Design | Closed |
Chamber Volume | 73.000 |
Material | Iron |
# Intake Valves per cyl | 1 |
# Intake Ports per cyl | 1 |
Intake Valve Dia | 2.11000 |
Intake Port Volume | 185.000 |
# Exhaust Valves per cyl | 1 |
# Exhaust Ports per cyl | 1 |
Exhaust Valve Dia | 1.77000 |
Exhaust Port Volume | 155.000 |
Notes | test RA IV head |
CYLINDER HEAD - AIRFLOW
Cylinder Head - Airflow: | ||
Test Pressure | xxx | |
Lift | Intake | Exhaust |
0.100 | xxx | xxx |
0.200 | xxx | xxx |
0.300 | xxx | xxx |
0.400 | xxx | xxx |
0.500 | xxx | xxx |
0.600 | xxx | xxx |
0.700 | xxx | xxx |
0.800 | xxx | xxx |
0.900 | xxx | xxx |
1.000 | xxx | xxx |
HEAD GASKET:
Head Gasket: | |
Gasket Thickness | 0.0410 |
Gasket Bore Dia | Pontiac |
Notes | test head gasket |
CAMSHAFT & VALVETRAIN
Camshaft: | |
Manufacturer | Pontiac |
Part Number | 9794041 |
Description | '70 Ram Air IV |
Lifter Type | Hydraulic |
Rating Method | Advertised |
Intake Duration - Advertised | 282.000 |
Intake Duration @ .050 | 262.000 |
Intake Lift | 0.51200 |
Exhaust Duration - Advertised | 320.00000 |
Exhaust Duration @ .050 | 262.00000 |
Exhaust Lift | 0.51200 |
Lobe Separation | 112.000 |
Install Offset | 0.000 |
Notes | test camshaft |
ROCKER ARMS:
Rocker Arms: | |
Manufacturer | Pontiac |
Part Number Dia | 64654654 |
Description | Ram Air IV |
Design | Stamped |
Ratio - Intake | 1.6500 |
Ratio - Exhaust | 1.6500 |
Notes | test rocker |
PUSHRODS
Pushrods: | |
Manufacturer | Pontiac |
Part Number | 64654654 |
Description | Ram Air IV |
Diameter | 0.34375 |
Length | 10.05000 |
Notes | test pushrod |
INDUCTION & FUEL DELIVERY:
THROTTLE BODY / CARBURETOR:
Throttle Body / Carburetor: | |
Manufacturer | Pontiac |
Part Number Dia | 46465465 |
Description | Qjet |
Airflow Rating | 680.000 |
Notes | test carb |
INTAKE MANIFOLD
Intake Manifold: | |
Manufacturer | Pontiac |
Part Number Dia | 797444 |
Description | Alum RA IV |
Design | Dual Plane |
Notes | test manifold |
EXHAUST SYSTEM:
EXHAUST MANIFOLD(S)
Exhaust Manifold: | |
Manufacturer | Pontiac |
Part Number Dia | fgh654654 |
Description | cast iron |
Primary Tube Diameter | 1.6500 |
Primary Tube Length | 28.0000 |
Collector Diameter | 2.8000 |
Collector Length | 3.0000 |
Notes | test exhaust manifold |
MUFFLER(S):
Mufflers: | |
Manufacturer | Pontiac |
Part Number | asdfsaf444 |
Description | bahblahblah |
Type | OE quiet |
Notes | test muffler |