351 Cleveland - 2

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Horsepower 

Base horsepower (Bhp) / rpm

 

 

 

Note: ’72 figures are SAE “net” Bhp

 

300 @ 5400   4V 70

285 @ 5400   4V 71

280 @ 5800   CJ 71

330 @ 5400   Boss 71

266 @ 5400   4V/CJ 72

275 @ 6000   “R” code 72

Torque (lb-ft @ rpm)

 

Note: ’72 figures are SAE “net”

380 @ 3400   4V 70

370 @ 3400   4V 71

345 @ 3800   CJ 71

370 @ 4000   Boss 71

301 @ 3600   4V/CJ 72

286 @ 3800   “R” Code 72

 

Compression Ratio (max.)

11.0:1    4V 70

10.7:1    4V 71

9.0:1     CJ 71

11.7:1   Boss 71

9.0:1     4V/CJ 72

9.2:1     “R” code 72

 

Bore

4.00

 

Stroke

3.50

 

Bore spacing

4.38

 

Head Volume (c.c)

61.3-64.3    4V 70

64.6-67.6    4V & Boss 71

73.9-76.9    CJ 71, 4V/CJ  “R” code 72

 

Crankshaft-Material

- Journal Dia-Main Rod

Nodular Iron (Boss selected for hardness)

2.749

 

Con Rods-Material

Forged Steel with 180,000 psi nut & bolt

(Boss & 72 “R” Code – Magnafluxed & shot peened)

 

Length (Ctr-to-Ctr)

5.78

 

Pistons-Material

Cast Aluminum   4V and CJ

Forged Alum.      Boss & 72 “R” Code

 

Compression Height

1.65     4V & CJ

1.657   72 “R” Code

1.631   71 Boss

 

Deck Clearance

0.035   4V & CJ

0.045   71 Boss

0.019   72 “R” Code

 

Cam-timing-Open/Close

Int.  14 /72    Exh. 70 /20           70-71 4V

       18 /72           82 /28           71 CJ

       14 /76          78 /32           72 4V/CJ

       34 /76          86 /24           71 Boss

       17 ½ /77 ½   77 ½ /17 ½   72 “R” Code

 

Duration/Overlap

226 /270 /34   70-71 4V

270 /290 /46   71-72 CJ

290 /290 /58   71 Boss

275 /275 /35   72 “R” Code

 

Valve Lift

0.427 I & E     70-71 4V

0.480/0.488    71-72 CJ

0.477 I & E    71 Boss

0.491 I & E    72 “R” Code

 

Tappets

Hydraulic       4V & CJ       

Mechanical    Boss & 72 “R” Code

 

Rocker Arm-Ratio

 -    Type

1.73:1

Lightweight stamping on pedestal

4V & CJ-non adjustable

Boss-adjustable

 

Valves-Head Dia-Intake

2.183-2.198

 

- Exhaust

1.705-1.715

 

Valve Stem Diameter

0.342

 

Valve Spring Load

 -   Closed Int. & Exh.

     (lbs @ installed ht.)

 -   Open Int. & Exh.

 

90 @ 1.82      4V & CJ

92 @ 1.82      Boss & 72 “R” Code

285 @ 1.32    4V & CJ

315 @ 1.32    Boss & 72 “R” Code

 

Firing Order

13726548

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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