Intake racing valve x 8. Exhaust racing valve x 8. Intake valve (mm): Head Dia 37.00 + 1.0 / Stem Dia 5.96 / Length 104.35. Exhaust valve (mm): Head Dia 33.00 + 1.0 / Stem Dia 5.96 / Length 104.70. and exit the combustion chamber as the valve extends.