1g's 90-the first half of 92 came with 6 bolts. Last half of 92-94 1g's came with 7 bolts. 2g's 95-99 come with 7 bolts from the factory... some have swapped out their 7 bolt for a 6 bolt.

2g's 4g63t 7 bolts are known for crankwalking... some earlier in the two digit thousand mileage some in the three digit thousand mileage and there's the few here and there that haven't had a problem.