The Enginetech V1797 exhaust valve features a 1.660" head diameter, 0.3410" stem (11/32" nominal), and 4.959" overall length with a chrome-plated stem. Fits 1973-1978 GM 5.7L/6.6L applications...
The Enginetech V1685 exhaust valve features a 1.662" head diameter, 0.3410" stem (11/32" nominal), and 4.982" overall length with a chrome-plated stem. Fits 1968-1972 GM 5.7L/6.6L/7.5L applications...
The Enginetech V1803 exhaust valve features a 1.770" head diameter, 0.3410" stem (11/32" nominal), and 4.975" overall length with a chrome-plated stem. Fits 1971-1973 GM 5.7L/6.6L/7.5L applications...