hopalong_70

Just be warned that the oil ring groove crosses over the wrist pin hole in the 347 pistons. This has been known to cause higher than normal oil usage. The reason they made a 331 kit is to take care of this problem with the pistons. If that doesnt' worry you, go with the 347. If it does, go with the 331. You just need to determine if the extra 16 cubes is worth the risk. Either way you go, Coast High Performance says that you'll still get 100k miles out of either kit with a street car.