GM 5.7L Vortec Cylinder Head Assembly | Sierra 18-4486HP
GM 5.7L Vortec Cylinder Head Assembly | Sierra 18-4486HP
Sierra
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GM 5.7L Vortec Cylinder Head Assembly | Sierra 18-4486HP
Completely assembled new marine cylinder head assembly fits GM 350 cu. in. marine engines with 8 intake manifold mounting bolts
- Fits 5.7L GM V8 Vortec engines from 1996 and up with press in rocker arm studs with 8 intake manifold mounting bolts
- Uses composite valve cover
- Complete new casting assembly with new stainless steel valves, hardened exhaust seats, valve springs, rocker arms, and retainers
- Sold individually - 2 required per engine
- Replaces Mercury 938-883297 1, 938-803860T, 938-883297R1
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! 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.