GM350 12558060 12529093 Auto Parts Cylinder Head for GM350 Cast Iron for Chevrolet Chevy 350 – OEM 12558060

Product Overview: This cylinder head assembly is manufactured for the GM 350 small-block V8 5.7-litre petrol engine, one of the most widely used American V8 platforms in passenger cars, pickups and performance builds. It is offered as a replacement casting for a cracked, warped or valve-damaged original head, machined to original equipment tolerances and suitable for both standard repair and rebuild projects.

Key Features: The casting is produced from high-strength cast iron and CNC-machined for accurate deck flatness, correct valve seat concentricity and consistent combustion chamber volume. The rectangular intake ports and 64cc combustion chambers reproduce the factory geometry required for correct airflow and compression. Valve guides and seats are machined to accept standard components, and the head is suitable for use with factory-specification intake manifolds and exhaust systems on Chevrolet and GMC applications.

Vehicle Compatibility: This head is intended for GM and Chevrolet 350 small-block V8 engines of 5.7 litres used in passenger cars, pickups and vans. Because the 350 platform was produced in many configurations with different accessory mounting and emissions provisions, confirm the casting number, chamber volume and port configuration against the original component before ordering.

Specifications: Engine code GM350; displacement 5.7 litres; V8; material cast iron; standard size; rectangular intake port shape; combustion chamber volume 64cc; eight cylinders; new condition; 12-month warranty; purpose replacement and repair.

OEM / Reference Numbers: 12558060 and 12529093. Cross-reference these numbers with the casting identification on the original cylinder head to confirm the correct specification.

Applications: Suitable for classic and modern passenger cars, pickups, vans, light trucks and performance rebuild projects using the small-block Chevrolet V8, including restoration work and general engine overhauls.

Benefits / Replacement Information: Installing this assembly restores compression, corrects coolant and combustion gas leakage caused by cracking or distortion, and provides a cost-effective alternative to reconditioning a badly worn original casting. Its robust cast iron construction suits high-load and performance applications.

Installation or Fitment Notes: Installation must be performed by a qualified engine builder. Check the block deck for flatness, select the correct head gaskets and head bolts for the application, and torque in the manufacturer's specified sequence. Verify valve train geometry, pushrod length and valve clearances during assembly, then run the engine, check for leaks and re-torque where required.