Holley JET For 1/4-32 Gas Main JETS 40-49 50-59 60-69 70-79 80-89 90-99 64-99 Posted on July 14, 2026 59 0.058″ / 1.47 mm. 64 0.064″ / 1.63mm. 49 0.049″ / 1.24mm. 79 0.089″ / 2.25mm. 78 0.087″ / 2.20 mm. 69 0.070″ / 1.78 mm. 70 0.073″ / 1.85 mm. 40 0.040″ / 1.02 mm.
