Federal Mogul 6631M30 Cast Aluminum Engine Piston Oversize - 0.030

The Federal Mogul 6631M30 is a cast aluminum engine piston in a 0.030 in. oversize. It is made for engine rebuilds where the cylinder bores have been machined larger than standard.

Key Features:

• 0.030 in. oversize (30 over): for blocks bored 0.030 in. over standard
• Cast aluminum construction: a piston material that balances strength, heat transfer and light weight

This piston suits engine rebuilders and machine shops doing a standard oversize bore rebuild. Measure the bore with a precision gauge before installing the piston. Follow the engine manufacturer's clearance specifications.