Cometic Gasket · New
Cometic GM Small Block Aluminum/Rubber Exhaust Port Cover Set - 18 Degree Heads
MPN C5258 · Store SKU cgsC5258
Supplier stock checked 11/7/2026, 11:38:30 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
The Cometic MLS gasket is comprised of three to five layers of stainless steel. Cometic uses stainless steel for increased strength, its ability to rebound and resist corrosion. The outer layers of the gasket are embossed and coated on both sides with a Viton rubber material designed to meet the demands of a variety of harsh sealing environments, load conditions and surface finishes. The Viton coating is heat resistant to 250°C or 482°F. GM Small Block Aluminum/Rubber Exhaust Port Cover Set, 18 Degree Heads GM Small Block Aluminum/Rubber Exhaust Port Cover Set; 18 Degree Heads GM Small Block 18 Degree Exhaust Port Cover Set Designed for extreme cylinder pressures
Manufacturer fitment & guides
Check C5258 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
