Seal the casting core openings and button the block back up with the Pioneer Automotive Industries Engine Expansion Plug Kit PE-166-R. Expansion plugs fill the core openings left in the engine block and cylinder head during the casting process, and this kit installs as a direct-fit replacement for the 1975 Buick Apollo and the 1975-1976 Buick Skylark, both equipped with the V8-4.3L engine.
If a leaking or corroded expansion plug is the source of your problem, driving in fresh plugs restores the seal at those openings. Always diagnose the cause of any leak before replacing, and consult the vehicle service information for the correct sealing and driving procedure.
Manufacturer part number PE-166-R (also PE166R).
What is the Pioneer Expansion Plug Kit PE-166-R?
It's a kit of expansion (core) plugs designed to seal the casting core openings left in the engine block and cylinder head during manufacturing.
What vehicles does this kit fit?
It's a direct-fit replacement for the 1975 Buick Apollo and the 1975-1976 Buick Skylark, both with the V8-4.3L engine. See the Buyer's Guide tab to confirm your vehicle.
How are expansion plugs installed?
Expansion (cup-style) plugs are press-fit — each plug is driven into its casting opening rather than bolted. Consult the service information for the correct driving and sealing procedure.
How do I know an expansion plug is failing?
Signs include weeping, seepage, dampness, or staining around a core opening in the block or head. Diagnose the source of any leak before replacing.
Are sealant or fasteners included?
This listing covers the expansion plugs. Refer to the vehicle service information for any recommended sealant and the correct installation specifications.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
