Our competition-quality valves are constructed of forged EN24N stainless steel. They are high-flow thin profile with waisted stems. All take single groove keeper. Long-stem valves for 1275cc 12G940 and 12G1316 cylinder heads. Sold each. Verify which type of valve tip you need, see comparison picture. Ref: I-34555.
These valves require matching keepers, see 88G0459.