Permatex Fine Grade Engine Valve Grinding & Lapping Paste (100g)
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Achieve a precise, gas-tight cylinder head seal with professional-grade silicon carbide abrasive paste.
Used and trusted by Bourne HPP in our own high-performance engine builds, Permatex Fine Grade Engine Valve Grinding Paste (100g) is engineered specifically for precision valve seating, removing carbon deposits, and restoring critical mating surfaces.
Featuring a specialised 180-grit silicon carbide formula suspended in a water-based compound, it delivers exceptional cutting control while leaving a uniform, burr-free finish to protect your engine's compression and horsepower.
Key Features & Benefits
Tested & Used by Bourne HPP: We rely on this exact compound in our own workshop for high-output engine prep and cylinder head servicing.
180 Grit Silicon Carbide (70 Microns): High-grade silicon carbide abrasive ideal for precision grinding and seating engine valves to achieve optimal gas-tight sealing without over-grinding.
Water-Based Formula: Easy to apply and effortless to clean up. Rinses away completely with water to prevent abrasive particles from contaminating your valve guides.
Integrated Corrosion Inhibitors: Formulated with active corrosion inhibitors that prevent oxidation on valves and valve seats during and after the lapping process.
Technical Specifications
| Feature | Details |
| Part Number | 12063 |
| Manufacturer | Permatex |
| Container Size | 100g (3.5 oz) Tube |
| Grit Rating | 180 Grit Silicon Carbide (70 Microns) |
| Base | Water-mixable |
| Application | Engine Valve Seating, Cylinder Head Servicing, Metal Surface Lapping |
| Condition | Brand New |
How to Lap Engine Valves
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Prep the Surface: Thoroughly clean the valve stem, valve guide, and seat area to remove grease and debris.
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Apply the Paste: Dab a thin, light layer of Permatex Fine Paste around the valve face.
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Lap the Valve: Insert the valve into its guide. Using a suction lapping tool, rotate the valve back and forth against the seat using light, steady pressure. Lift the valve occasionally to redistribute the paste.
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Inspect the Seat: Wipe both the valve face and seat clean with a damp cloth. Look for an unbroken, uniform, dull-grey ring across both mating surfaces.
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Clean Thoroughly: Wash all components thoroughly with hot water or degreaser before final assembly. Ensure all abrasive residue is completely removed from valve guides and surrounding engine parts.