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FAQs

By the span it needs across the head to reach the retainer, not by the valve. Ranges here run 35 to 142mm, 75 to 165mm, 80 to 145mm and a universal 55 to 175mm.

One where the jaw angle changes rather than the capacity, which lets it work on a head where the valves are not all presented the same way, such as an overhead cam head with the cam in place.

By bore diameter and grit. Hones run 25 to 57mm at 220 grit and 51 to 177mm at 180 grit, and the grit sets the finish rather than how fast material comes off.

Because the finish is what the rings bed to. Too coarse and the bore wears the rings; too fine and they never seat. The grit is stated with the stone set rather than being chosen separately.

Restores the sealing face between valve and seat by lapping them together, rather than replacing the valve. A valve grinder set does the same work powered.

With a cylinder head component organiser, which holds each valve with its own collets and springs. Mixing them across cylinders is how a rebuilt head ends up not sealing.

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A valve spring compressor has to span the head and reach the retainer, so its capacity range is what decides whether it fits at all. The range here runs 35 to 142mm, 75 to 165mm, 80 to 145mm and a universal 55 to 175mm, and that figure is measured on the head rather than the valve.

Multi-way compressors change the angle of the jaw rather than the capacity, which is what lets them work on a head where the valves are not all presented the same way. On an overhead cam head with the cam still in place, that is often the only route. A compressor that will not span the head is no use whatever its jaw capacity suggests.

Honing is measured differently again, by bore diameter and by grit. Hones here run 25 to 57mm at 220 grit and 51 to 177mm at 180 grit, and the grit sets the finish rather than the speed. A finer grit leaves a surface the rings will bed to. Both hones come with a stone set rather than needing stones ordered separately.

Valve grinding and seat cutting restore the sealing face rather than replacing the valve. Keeping the components in order matters as much as the tools, and a cylinder head component organiser holds each valve with its own collets and springs. Send the head detail to 07754288583 on WhatsApp. Sealey hold valve grinder sets alongside the Draper grinding kits at the same stage of the job.

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FAQs

By the span it needs across the head to reach the retainer, not by the valve. Ranges here run 35 to 142mm, 75 to 165mm, 80 to 145mm and a universal 55 to 175mm.

One where the jaw angle changes rather than the capacity, which lets it work on a head where the valves are not all presented the same way, such as an overhead cam head with the cam in place.

By bore diameter and grit. Hones run 25 to 57mm at 220 grit and 51 to 177mm at 180 grit, and the grit sets the finish rather than how fast material comes off.

Because the finish is what the rings bed to. Too coarse and the bore wears the rings; too fine and they never seat. The grit is stated with the stone set rather than being chosen separately.

Restores the sealing face between valve and seat by lapping them together, rather than replacing the valve. A valve grinder set does the same work powered.

With a cylinder head component organiser, which holds each valve with its own collets and springs. Mixing them across cylinders is how a rebuilt head ends up not sealing.

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