Sierra 18-1254 - Vortech Head Gasket Set
Sierra 18-1254 - Vortech Head Gasket Set
Sierra
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Sierra 18-1254 — Vortech Head Gasket Set
Sierra 18-1254 is a head gasket set for Vortech marine engines, giving you a fresh, reliable seal to head off coolant or compression leaks before they become bigger repairs. Replaces Mercury 27-75611A03 and Mallory 9-76133.
Part Specifications
- Sierra Part Number: 18-1254
- Type: Head gasket set
- Application: Vortech marine engines
- Replaces: Mercury 27-75611A03; Mallory 9-76133
Confirm Fitment Before Ordering
Not sure if this gasket set fits your engine? You can check the parts diagrams available on our website to help identify the correct part. Or, give us your engine model and serial number and we'll confirm it for you before you order — by email, text, or live chat.
Additional Information
- Vendor: Sierra International
- Part Number: 18-1254
- OEM Cross-Reference: Mercury 27-75611A03; Mallory 9-76133
Installation Notes
Install following the applicable Vortech engine service manual, torquing head bolts to factory specification in the correct sequence.
Frequently Asked Questions
Q: How do I confirm this gasket set fits my engine?
A: Send us your Vortech engine model and serial number and we'll confirm 18-1254 is the correct head gasket set for your engine — by email, text, or live chat.
Q: What are signs I need a new head gasket?
A: Common signs include coolant loss with no visible external leak, white or milky oil, overheating, or visible coolant/oil mixing.
Q: Does this replace Mercury 27-75611A03 directly?
A: Yes, Sierra 18-1254 is a direct replacement for Mercury 27-75611A03 and Mallory 9-76133.
Q: Should I replace both head gaskets if only one side is leaking?
A: It's common practice to replace both sides together when the engine is already apart, since the labor to access one side is largely the same as both, and it helps avoid a repeat teardown later.
Q: Is this a complete gasket set?
A: Yes, this set includes the head gaskets needed for a proper reseal.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.