General

• Compression Ratio

9.6:1 - ZZ454/440

8.75:1 - 454HO

• Displacement

7.4L

454 CID

• Firing Order

1-8-4-3-6-5-7-2

• Fuel

Premium Unleaded - 92 (R+M/2)

• Maximum Engine Speed

5,500 RPM

• Oil Filter

AC Delco - PF1218

• Oil Pressure - Minimum @ 1000 RPM

41 kPa

6 PSI

• Oil Pressure - Minimum @ 2000 RPM

124 kPa

18 PSI

• Oil Pressure - Minimum @ 4000 RPM

165 kPa

24 PSI

• Recommended Oil

5w30 Synthetic Racing Oil - ZZ454/440 (After Break-in)

5w30 Synthetic Oil - 454HO (After Break-in)

• Spark Plugs

Ac Delco Rapidfire #4 - ZZ454/440

AC Delco - MR43T - 454HO

• Spark Plug Gap

1.01 mm

0.040 in

Camshaft

• Camshaft Lobe Lift - Exhaust

13.71 mm

.540 in

• Camshaft Lobe Lift - Intake

12.95 mm

.510 in Intake

• Camshaft Duration

211° Intake, 230° Exhaust @ 0.050 in (127 mm) Tappet Lift

• Camshaft Centerline

112° ATDC Intake

112° BTDC Exhaust

• Tappet Type

Hydraulic Roller Tappet

• Rocker Arm Ratio

1.7:1

Stamped Steel

Cylinder Head

Cast Aluminum with Oval Ports - ZZ454/440

Cast Iron with Rectangular Ports - 454HO

• Valve Head Diameter - Exhaust

47.75 mm

1.88 in

• Valve Head Diameter - Intake

55.62 mm

2.19 in

• Chamber Volume

110 cc - ZZ454/440

118 cc - 454HO

• Valve Lash

1/8 Turn Down From 0 - ZZ454/440

Torque Bolt to 61N·m (45 lb ft) - 454HO

General

• Block

Cast Iron with Four-bolt Main Caps

• Bore x Stroke

108 mm x 102 mm

4.25 in x 4.00 in

• Crankshaft

Forged Steel with One Piece Rear Seal

• Connecting Rods

Forged Steel - 7/16 in Bolts

• Deck Height from C/S Centerling

249 mm

9.80 in

• Displacement

7.4L

454 CID

• Firing Order

1-8-4-3-6-5-7-2

• Fuel

Premium Unleaded - 92 (R+M/2)

• Maximum Engine Speed

5,500 RPM

• Oil Filter

AC Delco - PF1218

• Oil Pressure - Minimum @ 1000 RPM

41 kPa

6 PSI

• Oil Pressure - Minimum @ 2000 RPM

124 kPa

18 PSI

• Oil Pressure - Minimum @ 4000 RPM

165 kPa

24 PSI

• Oil Pan

5.67L

6 QT

• Pistons

Forged Aluminum

• Recommended Oil

5w30 Synthetic Oil (After Break-in)

• Rings

Chrome Moly

General

• Compression Ratio

8.75:1 - 502HO and HT502

9.6:1 - 502/502

• Displacement

8.2L

502 CID

• Firing Order

1-8-4-3-6-5-7-2

• Fuel

Premium Unleaded - 92 (R+M/2)

• Maximum Engine Speed

5,200 RPM - HT502

5,500 RPM - 502HO

5,800 RPM - 502/502

• Oil Filter

AC Delco - PF1218 - 502HO and HT502

AC Delco - PF1218 - 502/502

• Oil Pressure - Minimum @ 1000 RPM

41 kPa

6 PSI

• Oil Pressure - Minimum @ 2000 RPM

124 kPa

18 PSI

• Oil Pressure - Minimum @ 4000 RPM

165 kPa

24 PSI

• Recommended Oil

5w30 Synthetic Racing Oil - 502/502 (After Break-in)

5w30 Synthetic Motor Oil - 502HO and HT502 (After Break-in)

• Spark Plugs

AC Delco Rapidfire #4 - 502/502

AC Delco - MR43T - 502HO

AC Delco - R43T - HT502

• Spark Plug Gap

1.01 mm

0.040 in

Camshaft

• Camshaft Lobe Lift - Exhaust

12.26 mm - HT502

13.71 mm - 502HO

13.81 mm - 502/502

.483 in - HT502

.540 in - 502HO

.544 in - 502/502

• Camshaft Lobe Lift - Intake

12.26 mm - HT502

12.95 mm - 502HO

13.38 mm - 502/502

.480 in - HT502

.510 in - 502HO

.527 in - 502/502

• Camshaft Duration

204° Intake, 209° Exhaust @ 0.050 in (127 mm) Tappet Lift - HT502

211° Intake, 230° Exhaust @ 0.050 in (127 mm) Tappet Lift - 502HO

224° Intake, 234° Exhaust @ 0.050 in (127 mm) Tappet Lift - 502/502

• Centerline

118° ATDC Intake and 118° BTDC Exhaust - HT502

112° ATDC Intake and 112° BTDC Exhaust - 502HO

104° ATDC Intake and 109° BTDC Exhaust - 502/502

• Tappet Type

Hydraulic Roller Tappet

• Rocker Arm Ratio

1.7:1

Stamped Steel

Cylinder Head

Cast Aluminum with Oval Ports - 502/502

Cast Iron with Rectangular Ports - 502HO

Cast Iron with Oval Ports - HT502

• Valve Head Diameter - Exhaust

43.68 mm - HT502

47.75 mm - 502HO and 502/502

1.72 in - HT502

1.88 in - 502HO and 502/502

• Valve Head Diameter - Intake

52.57 mm - HT502

55.62 mm - 502HO

57.15 mm - 502/502

2.07 in - HT502

2.19 in - 502HO

2.25 in - 502/502

• Chamber Volume

110 cc - 502/502

118 cc - HT502 and 502HO

• Valve Lash

1/8 Turn Down From 0 - 502/502

Torque Bolt to 61N·m (45 lb ft) - 502HO and HT502

General

• Block

Cast Iron with Four-bolt Main Caps

• Bore x Stroke

114 mm x 102 mm

4.47 in x 4.00 in

• Camshaft Lift - Exhaust

13.81 mm

.544 in

• Camshaft Lift - Intake

13.38 mm

.527 in

• Camshaft Duration

224 Intake, 234 Exhaust @ 0.050 in (127 mm) Tappet Lift

• Center Line

104 ATDC Intake and 109 BTDC Exhaust

• Crankshaft

Forged Steel with One Piece Rear Seal

• Connecting Rods

Forged Steel - 7/16 in Bolts

• Deck Height from C/S Centerling

249 mm

9.80 in

• Displacement

8.2L

502 CID

• Firing Order

1-8-4-3-6-5-7-2

• Fuel

Premium Unleaded - 92 (R+M/2)

• Maximum Engine Speed

5,800 RPM

• Oil Filter

AC Delco - PF454

• Oil Pressure - Minimum @ 1000 RPM

41 kPa

6 PSI

• Oil Pressure - Minimum @ 2000 RPM

124 kPa

18 PSI

• Oil Pressure - Minimum @ 4000 RPM

165 kPa

24 PSI

• Oil Pan

5.67L

6 QT

• Pistons

Forged Aluminum

• Recommended Oil

5w30 Synthetic Motor Oil (After Break-in)

• Rings

Chrome Moly

• Timing Chain

Single Roller

General

• Compression Ratio

9.6:1 - ZZ572/620

12:1 - ZZ572/720

• Displacement

9.3L

572 CID

• Firing Order

1-8-4-3-6-5-7-2

• Fuel

Premium Unleaded - 92 (R+M/2) - ZZ572/620

Racing Fuel- 110 (R+M/2) - ZZ572/720

• Maximum Engine Speed

6,000 RPM - ZZ572/620

6,750 RPM - ZZ572/720

• Oil Filter

AC Delco - UPF35L

• Oil Pan - GEN VI

5.67L

6 QT

• Oil Pressure - Normal @ 1500 RPM

379 kPa

55 PSI

• Oil Pressure - Normal @ 5000 RPM using 20w50 Racing Oil

434 kPa

63 PSI

• Recommended Oil

20w50 Synthetic Racing Oil (After Break-in)

• Spark Plugs

AC Delco - R45XLS - ZZ572/620

AC Delco - R42XLS - ZZ572/720

• Spark Plug Gap

0.88 mm

0.035 in

Camshaft

• Camshaft Lobe Lift - Exhaust

16.81 mm - ZZ572/620

18.13 mm - ZZ572/720

.632 in - ZZ572/620

.714 in - ZZ572/720

• Camshaft Lobe Lift - Intake

16.81 mm - ZZ572/620

18.13 mm - ZZ572/720

.632 in - ZZ572/620

.714 in - ZZ572/720

• Camshaft Duration

254° Intake, 264° Exhaust @ 0.050 in (127 mm) Tappet Lift - ZZ572/620

278° Intake, 282° Exhaust @ 0.050 in (127 mm) Tappet Lift - ZZ572/720

• Centerline

109° ATDC Intake and 119° BTDC Exhaust

• Advertised Duration

316° Intake, 326° Exhaust @ 0.004 in (101 mm) Tappet Lift - ZZ572/620

310° Intake, 314° Exhaust @ 0.004 in (101 mm) Tappet Lift - ZZ572/720

• Tappet Type

Hydraulic Roller Tappet - ZZ572/620

Mechanical Roller Tappet - ZZ572/720

• Rocker Arm Ratio

1.7:1

Aluminum Roller Rocker

Cylinder Head

Aluminum with Rectangular Ports and Stainless Steel Valves

• Valve Head Diameter - Exhaust

47.75 mm

1.88 in

• Valve Head Diameter - Intake

57.15 mm

2.25 in

• Chamber Volume

118 cc

• Valve Lash

1/8 Turn Down from 0 lash for ZZ572/620 and 0.014 in cold and 0.020 in hot for ZZ572/720

• Valve Spring (Dual) - Average Spring Rate

480 lbs for ZZ572/620

652 lbs for ZZ572/720

General

• Block

Cast Iron, Four-bolt Intermediate Mains With Splayed Outers

• Bore x Stroke

116 mm x 111 mm

4.56 in x 4.375 in

• Crankshaft

4340 Forged Steel with One Piece Rear Seal

Internally Balanced

• Connecting Rods

166 mm (6.535 in) Center to Center

Forged 4340 Steel

H-beam Style and Shot Peened

• Deck Height

259 mm

10.2 in

• Displacement

9.3L

572 CID

• Firing Order

1-8-4-3-6-5-7-2

• Oil Pressure - Normal @ 1500 RPM

379 kPa

55 PSI

• Pistons

Forged Aluminum With Full Floating Wrist Pins

• Piston Rings

Plasma - Moly Rings

• Recommended Oil

5w50 Synthetic Racing Motor Oil (After Break-in)