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Parker · 06-23-2009, 09:06 PM

It should be a 15mm bolt head or maybe a 13mm. All the current gm gas engines use a 15mm headed plug. And don't tighten to hard cause you'll stretch the bolt and kill the threads.

06-23-2009, 09:06 PM	#24
Parker Drives: 2010 Camaro SS/RS Join Date: Jan 2009 Location: SoCal Posts: 246 View My Garage	It should be a 15mm bolt head or maybe a 13mm. All the current gm gas engines use a 15mm headed plug. And don't tighten to hard cause you'll stretch the bolt and kill the threads.