[justa6]

The Grand Nationals came with hyperuteptic pistons, stock.

They don't blow UNLESS you have massive detonation. I'm talking about something you'll never hear in a normally aspirated motor. Detonation that actually feels like a rod just went through the block. There are a lot of GN's around with 150-200 thousand miles and never lost a piston. And they aren't exactly babied.

As you said they frag when they fail but as you also said the forged loose a skirt so to me when a piston fails it makes little difference in the outcome. Rebuild time.

As far as the Cobra goes the Buick V6 in it is not the same as the Grand National motor by a long shot. Its the same block as the Menard Indy motor and was used in Busch racing for a number of years. ie its a pure race motor that doesn't even have an internal oiling system. It only uses a Dry sump system.

Its fine on the street though, for a little motor (274"). 390 ft/lb of torque and 473 HP. Runs 10.8 and it will probably get down to mid 10's when its completely dialed in. (Hope so anyway)

Regards,