Mobil 1 Oil Cap

GM Mobil 1 oil cap for 97 to present V8 engines LS1, LS2, LS4, LS6 and LS7 engines. Fits the following Corvette, Camaro, Firebird, GTO and 5.3L engines in the '06 Impala SS, '06 Monte Carlo SS and '05-06 Grand Prix GXP This cap is the quarter turn type. This cap does not fit the LT1 or LT4 engine or older Chevy engines. I am often asked will this cap fit other non LS1 or non Vortec engine and I really don't know this is AC Delco replacement part for the corvette. The base of the cap measures 1 3/8" outside diameter and have found that if you are unsure measure your cap and if the bottom is 1 3/8” and quarter turn cap it should fit.