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This special formula was also specifically designed to minimize valve “bounce,” associated with high RPM (above 8000) and with radical cam grinds lacking a sufficient closing ramp. The thermal conductivity of CA-18 is vastly superior to the ductile iron seat in the casting of “after-market” cylinder heads.

Tolerances can be held at ±0.0001 inch in diameter and ±0.0005 inch in thickness. Normal diameter sizes range from 1.3000 to 3.0000 inch. Any angle, multiple angles, radius or multiple radii can be machined inside the valve seat.

X-274: CHE Precision formulated X-274, in response to unique circumstances incurred while dealing with the specific applications of exhaust seats. This material was custom designed to resist the extreme exhaust temperatures associated with auto racing engines. The thermal conductivity is 15% greater than that of beryllium copper, thus greatly reducing the temperature of the exhaust valve. This remarkable formula was also designed to minimize valve “bounce,” associated with high RPM (above 8000) and with radical cam grinds lacking a sufficient closing ramp.

The expansion rates of this seat are also similar to that of the aluminum used in the casting of the  “after-market” heads. Tolerances can be held at ±0.0001 inch in diameter and ±0.0005 inch in thickness. Normal diameter sizes range from 1.0000 to 2.2000 inch. Any angle, multiple angles, radius or multiple radii can be machined inside the valve seat.

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