Why Choose a Cometic MLS Head Gasket?
Ford Windsor engines remain popular for classic restorations, street performance builds, and custom engine swaps.
However, reliable cylinder head sealing becomes increasingly important when changing compression ratio, installing aftermarket aluminum heads, or adding forced induction.
The Cometic C5511-040 uses three stainless steel layers with embossed sealing features designed to maintain contact pressure between the cylinder head and engine block.
Its .040-inch compressed thickness also allows engine builders to account for gasket dimensions during engine assembly.
FYI: Understanding the 4.030-Inch Gasket Bore
Most factory Ford 289, 302, and 351W engines use a nominal 4.000-inch cylinder bore.
The Cometic C5511-040 has a 4.030-inch gasket opening.
This does not automatically mean the gasket is suitable for every 4.030-inch overbore. The finished cylinder diameter, gasket opening, combustion chamber shape, and head-to-block alignment must all be checked.
If your Windsor engine has been bored beyond the gasket’s safe sealing dimensions, select a larger gasket opening.
Cometic offers additional non-SVO Windsor MLS gasket bore sizes for modified engines.
Installation Recommendations
- Confirm the engine is a compatible Ford Windsor small-block V8.
- Verify that the cylinder heads use the appropriate non-SVO gasket pattern.
- Measure the finished cylinder bore.
- Inspect the cylinder heads and block deck for warpage or damage.
- Confirm the surface finish meets Cometic MLS installation requirements.
- Clean the sealing surfaces thoroughly.
- Check gasket alignment and fluid passages.
- Install the gasket without additional sealant unless Cometic specifies otherwise.
- Use the correct cylinder head bolts or studs and tightening procedure.
- Complete assembly and inspect for leaks.
Frequently Asked Questions
Does Cometic C5511-040 fit a Ford 302?
Yes, it is designed for compatible Ford 302 Windsor configurations with non-SVO cylinder heads and the appropriate cylinder bore.
Will it work on a 351 Windsor?
Yes, provided the engine uses a compatible non-SVO cylinder head arrangement and the gasket opening is suitable for the finished bore.
Does it fit a 5.0 Mustang?
It may fit compatible 5.0L Windsor engines. Confirm the exact engine and cylinder head configuration before ordering.
Does this gasket fit a Ford 351 Cleveland?
No. The 351 Cleveland uses a different cylinder head and block architecture.
Can it be used with aluminum cylinder heads?
Yes, when the head and block are compatible with this gasket design and the mating surfaces meet MLS requirements.
Does the package include two gaskets?
No. Cometic C5511-040 is sold individually. A complete V8 engine typically requires two.
Build Your Ford Windsor Engine with Cometic
The Cometic C5511-040 MLS Head Gasket combines a 4.030-inch round bore, .040-inch compressed thickness, and three-layer stainless steel construction for compatible Ford 289, 302, and 351W small-block V8 engines.
Whether you’re restoring a classic Mustang or building a performance Windsor engine, proper head gasket selection and installation help establish reliable engine operation.
Shop Ford performance engine parts and replacement components at Pro Street Online.
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