99 Pontiac Grand am se head gasket repair 3.4
Possible the timing marks are not lined up on the crankshaft gear and the camshaft gear. When you re-install the timing chain your suppose to rotate the engine by hand 2 revolutions to make sure the timing marks line back up.
You also need to check where the timing marks are supposed to be. On some engines it's 12 o'clock on both the crankshaft and camshaft sprockets. On others it's crankshaft 12 o'clock and camshaft 6 o'clock. HTH. -Jim
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