timing advance

Got questions? We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re making a few jetting changes to accommodate for high-humidity racing.                                 D.D. • Agana, Guam Q: I recently bought a 1970 Plymouth GTX. It came equipped with a Chrysler 440, a 750 cfm carb on an Edelbrock manifold, a stock Chrysler