replaced head gasket, do pistons have to be at tdc for car to start?

2006 PONTIAC GTO
76,000 MILES
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06LS2GTO
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  • 11 POSTS
some of the pistons are halfway down and some are all the way up
Dec 20, 2011 at 9:39 PM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,398 POSTS
How do you want them to be, all up at the same time? Only the number one piston must be at top dead center, and the camshaft(s) sprockets must be lined up with the timing marks when the timing chain is installed.
Dec 20, 2011 at 9:52 PM
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