| Type | 90V |
| Number of Cylinders | 8 |
| Bore | 4.000" |
| Stroke | 3.58" |
| Piston Displacement | 360 cu. in. |
| Compression Ratio | 8.4 to 1
8.0 to 1 H.P. |
| Minimum Compression Pressure with Engine
Warm, Spark Plugs Removed Wide-Open Throttle |
100 psi |
| Maximum Variation between Cylinders
(any one engine) |
40 psi |
| Firing Order | 1-8-4-3-6-5-7-2 |
| Basic Timing | Refer to emission control information
vehicle |
| CYLINDER NUMBERING (front to rear) | |
| Left Bank | 1-3-5-7 |
| Right Bank | 2-4-6-8 |
| CYLINDER BLOCK | |
| Cylinder Bore (standard) | 4.000"-4.0020" |
| Cylinder Bore Out-of-Round
(Max. allowable before reconditioning) |
.005" |
| Cylinder Bore Taper
(Max. allowable before reconditioning) |
.010" |
| Reconditioning Working Limits
(for taper and out-of-round) |
.001" |
| Maximum Allowable Oversize (cylinder bore) | .040" |
| Tappet Bore Diameter | .9051"-.9059" |
| Distributor Lower Drive Shaft Bushings
(press fit in block) |
.0005"-.014" |
| Shaft to Bushing Clearance | .0007"-.0027" |
| PISTONS | |
| Type Material | Alloy Tin Coated |
| Land Clearance (diametrical) | .020"-.026" |
| Clearance at Top of Skirt | .0005"-.0015"
.001"-.002" 4BBL and H.P. |
| Weight (Std. through .040" oversize) | 584 gms. |
| Piston Length (overall) | 3.19 |
| Ring Groove Depth | |
| No. 1 | .210" |
| No. 2 | .210" |
| No. 3 | 1.99" |
| Pistons for Service | Std., .020",
Oversize |
| PISTON PINS | |
| Type | Press Fit in Rod |
| Diameter | .9841"-.9843" |
| Length | 2.990"-3.000" |
| Clearance in Piston (Light Thumb Push @ 70 F.) | .00025"-.00075" |
| End Play | None |
| Clearance in Rod | .0007"-.0014"
(Interference) |
| Pins for Service | Standard,
.003" and .008" oversize |
| PISTON RINGS | 3 |
| Number of Rings per Piston | 2 |
| Compression | 1 |
| Oil | 3-piece |
| Oil Ring Type | steel rail
chrome-face |
| Ring Width | |
| Compression | .0770"-.0780" |
| Oil-Steel rails | .0252" Max |
| Ring Gap | |
| Compression | .010"-.020" |
| Oil-Steel rails | .015"-.055" |
| Ring Side Clearance | |
| Compression | .0015"-.0030" |
| Oil-Steel rails | .0002"-.005" |
| Service Rings-Ring Gap | |
| Compression | .010"-.020" |
| Oil-Steel rails | .010"-.062" |
| Service Rings-Ring Side Clearance | |
| Compression | .0015"-.004" |
| Oil-Steel rails | .0002"-0.005" |
| CONNECTING RODS | |
| Length (Center to Center) | 6.121" |
| Weight (less bearing shells) | 758 gms. |
| Side Clearance (two rods) | .006"-.014" |
| Piston Pin Bore Diameter | .9829"-.9834" |
| CONNECTING ROD BUSHING | |
| Type | None
Steel Backed |
| CONNECTING ROD BEARINGS (Type) | Tri-Metal |
| Diameter and Width | 2.126" X .842" |
| Clearance desired | .0005"-.0025" |
| Maximum Allowable | .0025" |
| Bearings for Service | Std., .001", .002"
.010", .012" |
| CRANKSHAFT | |
| Type | Fully Externally Balanced |
| Bearings | Steel Backed
Lead-Aluminum #5 Babbit |
| Thrust Taken By | No. 3 Main Bearing |
| End Play | .002"-.009" |
| Maximum Allowable | .010" |
| Diametral Clearance Desired | .0005"-.0020" |
| Diametral Clearance Allowed | .0025" |
| Finish at Rear Oil Seal Surface | Diagonal Knurling |
| MAIN BEARING JOURNALS | |
| Diameter | 2.8095"-2.8105" |
| Maximum Allowable Out-of-Round and/or Taper | .001" |
| Bearings for Service Avaiable in
Standard and the following undersizes |
.001", .002", .003", .010", .012" |
| CONNECTING ROD JOURNALS | |
| Diameter | 2.124"-2.125" |
| Maximum Allowable Out-of-Round and/or Taper | .001" |
| CAMSHAFT | |
| Drive | Chain |
| Bearings | Steel Backed
Babbit |
| Number | 5 |
| Diametral Clearance | .001"-.003" |
| Maximum Allowable before Reconditioning | .005" |
| Thrust Taken By | Thrust Plate |
| End Play | .002"-.010" |
| Maximum Allowable | .010" |
| CAMSHAFT JOURNALS | |
| Diameter No.1 | 1.998"-1.999 |
| No. 2 | 1.982"-1.983" |
| No. 3 | 1.967"-1.968" |
| No. 4 | 1.951"-1.952" |
| No. 5 | 1.5605"-1.5615" |
| CAMSHAFT BEARINGS | |
| Diameter No. 1 | 2.000"-2.001" |
| No. 2 | 1.984"-1.985" |
| No. 3 | 1.969"-1.970" |
| No. 4 | 1.953"-1.954" |
| No. 5 | 1.5625"-1.5635" |
| VALVE TIMING (in Degrees) | |
| Intake Opens (BTC) | 18 |
| Intake Closes (ABC) | 54 |
| Exhaust Opens (BBC) | 57 |
| Exhaust Closes (ATC) | 15 |
| Valve Overlap | 33 |
| Intake Valve Duration | 252 |
| Exhaust Valve Duration | 252 |
| TIMING CHAIN | |
| Number of Links | 68 |
| Pitch | .375" |
| Width | .625" |
| TAPPETS | |
| Type | Hydraulic |
| Body Diameter | .9035"-.9040" |
| Clearance in Block | .0011"-.0024" |
| Service Tappets Available | Std., .001", .008", .030" |
| Dry Lash | .060"-.210" |
| CYLINDER HEAD | |
| Valve Seat Run-Out (Maximum) | .003" |
| Intake Valve Seat Angle (in Degrees) | 45-45 1/2 |
| Seat Width (finish) | .065"-.085" |
| Exhaust Valve Seat Angle (in Degrees) | 45-45 1/2 |
| Seat Width (finish) | .080"-.100" |
| Cylinder head gasket (Thickness
compressed |
.033" |
| VALVE GUIDES | |
| Type | Cast in Head |
| Guide Bore Diameter | .374"-.375" std. |
| VALVES (INTAKE) | |
| Head Diameter | 1.88"
1.88" H.P. |
| Length (to center of valve face) | 4.90" |
| Stem Diameter (Standard) | .372"-.373"
.3715"-.3725" H.P. |
| Stem to Guide Clearance | .001"-.003"
.0015"-.0035" H.P. |
| Maximum Allowable by rocking method | .017" |
| Face Angle (in Degrees) | 44-1/2 to 45 |
| Valve for Service (Oversize Stem Diam.) | Std., .005", .015", .030" |
| Lift (Zero Lash) | .410" |
| VALVES-(EXHAUST) | |
| Head Diameter | 1.60" |
| Length to (center of Valve face) | 4.9" |
| Stem Diameter (Standard) | .371"-.372"
.3705"-.3715" H.P. |
| Stem to Guide Clearance | .002"-.004"
.0025"-.0045" H.P. |
| Maximum Allowable by rocking method | .017" |
| Face Angle (in Degrees) | 44-1/2-45 |
| Valve for Service (Oversize Stem Diam.) | Std., .005", .015",
.030" |
| Lift (Zero Lash) | .410"
.410" H.P. |
| VALVE SPRINGS | |
| Number | 16 |
| Free Length | 2.00"
2.10" H.P. |
| Load when Compressed to (valve closed with surge
damper removed) |
78-88lbs. @1-11/16"
108-118lbs. @1-21/32" H.P. |
| Load when Compressed to (valve open with surge
damper removed) |
170-184 lbs. @ 1-5/16"
186-200lbs. @ 1-1/4" H.P. |
| Valve Spring ID | 1.010"-1.030" |
| Maximum Allowable Our of Plumb | 1/16"
.08" H.P. |
| Valve Spring Installed Height (spring seat
to
retainer) |
1-5/8"-1-11/16" |
| Use 1/16" Spacer to Reduce Spring Height when Over Specifications |
