12568774 454 HO--with Iron Heads and Roller Cam
Flywheel / Flexplate
Like all big block V8 engines, the 454HO engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped with a 14" diameter flexplate with a 168 tooth ring gear, GM Part Number 10185034. If your application requires a flywheel, GM Part Number 14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt GM Part Number 12337973 (6 required).
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.
Oil Pan
The 454HO engine includes oil pan, GM Part Number 10240721. This six-quart pan was originally designed for marine and truck usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the engine. If the six-quart pan will not fit into your application, GM Part Number 12495360 is recommended as a substitute. This is a four-quart, right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Headers
A 454HO engine should be equipped with a header exhaust system for maximum performance in applications where a non-production exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 2" diameter primary pipes, 36 inches long, with 3 1/2" diameter collectors. Use 3" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.
Rocker Covers
The 454HO engine comes equipped with die cast rocker covers, GM Part Numbers 12553666 and 12553667. Additional tall and short valve covers are available. Please see the website at www.GMPerformanceparts.com or your local GM Performance Parts dealer. When using either the cast aluminum or the tall, chrome rocker covers; ensure that enough clearance exists between the cover and the brake booster.
12498777 ZZ454/440--440 Horsepower with Aluminum Heads
Flywheel / Flexplate
Like all big block V8 engines, the ZZ454/440 engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped with a 14" diameter flexplate with a 168 tooth ring gear, GM Part Number 10185034. If your application requires a flywheel, GM Part Number 14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt GM Part Number 12337973 (6 required).
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.
Oil Pan
The ZZ454/440 engine includes oil pan, GM Part Number 10240721. This six-quart pan was originally designed for marine and truck usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the engine. If the six-quart pan will not fit into your application, GM Part Number 12495360 is recommended as a substitute. This is a four-quart, right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Headers
A ZZ454/440 engine should be equipped with a header exhaust system for maximum performance in applications where a non-production exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 2" diameter primary pipes, 36 inches long, with 3 1/2" diameter collectors. Use 3" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.
Rocker Covers
The ZZ454/440 engine comes equipped with die cast rocker covers, GM Part Numbers 12553666 and 12553667. Additional tall and short valve covers are available. Please see the website at www.GMPerformanceparts.com or your local GM Performance Parts dealer. When using either the cast aluminum or the tall, chrome rocker covers; ensure that enough clearance exists between the cover and the brake booster.
12568778 502 HO--with Iron Heads and Roller Cam
Flywheel / Flexplate
Like all big block V8 engines, the 502HO engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped with a 14" diameter flexplate with a 168 tooth ring gear, GM Part Number 10185034. If your application requires a flywheel, GM Part Number 14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt GM Part Number 12337973 (6 required).
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.
Oil Pan
The 502HO engine includes oil pan, GM Part Number 10240721. This six-quart pan was originally designed for marine and truck usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the engine. If the six-quart pan will not fit into your application, GM Part Number 12495360 is recommended as a substitute. This is a four-quart, right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Headers
A 502HO engine should be equipped with a header exhaust system for maximum performance in applications where a non-production exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 2" diameter primary pipes, 36 inches long, with 3 1/2" diameter collectors. Use 3" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.
Rocker Covers
The 502HO engine comes equipped with die cast rocker covers, GM Part Numbers 12553666 and 12553667. Additional tall and short valve covers are available. Please see the website at www.GMPerformanceparts.com or your local GM Performance Parts dealer. When using either the cast aluminum or the tall, chrome rocker covers; ensure that enough clearance exists between the cover and the brake booster.
12496963 ZZ502 Base Engine, with Aluminum Heads
Flywheel / Flexplate
Like all big block V8 engines, the 502/502 engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped with a 14" diameter flexplate with a 168 tooth ring gear, GM Part Number 10185034. If your application requires a flywheel, GM Part Number 14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt GM Part Number 12337973 (6 required).
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.
Indicator Tube
The indicator and indicator tube come installed on the engine. One end is pushed into the hole on the oil pan and sealed with an o-ring. The other end is fastened to the block using a bolt and a spacer. When removing the dipstick to install the engine or headers, be sure not to loose the small o-ring which seals the dipstick tube to the pan. The o-ring must be reinstalled on the dipstick tube before inserting it into the pan. Make sure the tube is bottomed out in the pan before tightening the dipstick tube to the header bolt. Also, the spacer and fastener that were attaching the dipstick tube to the engine will not be required once the headers are installed. They were for shipping purposes only.
Oil Pan
The 502/502 engine includes oil pan, GM Part Number 10240721. This six-quart pan was originally designed for marine and truck usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the engine. If the six-quart pan will not fit into your application, GM Part Number 12495360 is recommended as a substitute. This is a four-quart, right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Headers
A 502/502 engine should be equipped with a header exhaust system for maximum performance in applications where a non-production exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 2" diameter primary pipes, 36 inches long, with 3 1/2" diameter collectors. Use 3" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.
Rocker Covers
The 502/502 engine comes equipped with die cast rocker covers, GM Part Number 12495488. This package includes two covers, 14 bolts, two grommets, and an oil fill hole cap. Chrome Chevrolet Bow Tie rocker covers are available in both tall and short configurations, GM Part Number 12342099, and 12342093 respectively. Cast aluminum rocker covers are also available, GM Part Number 12371244. When using either the cast aluminum or the tall, chrome rocker covers; ensure that enough clearance exists between the cover and the brake booster.
88890534 HT502--Truck Replacement Engine
Flywheel / Flexplate
Like all big block V8 engines, the HT502 engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped with a 14" diameter flexplate with a 168 tooth ring gear, GM Part Number 10185034. If your application requires a flywheel, GM Part Number 14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt GM Part Number 12337973 (6 required).
Pilot Bearing
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.
Oil Pan
The HT502 engine includes oil pan, GM Part Number 10240721. This six-quart pan was originally designed for marine and truck usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the engine. If the six-quart pan will not fit into your application, GM Part Number 12495360 is recommended as a substitute. This is a four-quart, right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Headers
An HT502 engine should be equipped with a header exhaust system for maximum performance in applications where a nonproduction exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 2" diameter primary pipes, 36 inches long, with 3 1/2" diameter collectors. Use 3" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.
Rocker Covers
The HT502 engine comes equipped with die cast rocker covers, GM Part Numbers 12553666 and 12553667. Additional tall and short valve covers are available. Please see the website at www.GMPerformanceparts.com or your local GM Performance Parts dealer. When using either the cast aluminum or the tall, chrome rocker covers; ensure that enough clearance exists between the cover and the brake booster.
