Can You Put Heads on High Mileage car?

[91GTturbo]

I'll add my .02 cents for what it's worth.

True hyperutectic pistons are not as strong as forged pistons, but they will hold up better than most people think. The key is in the TUNE. Horesman, just because you had one bad piston, does not make them all bad. Bad parts roll out of manufacturing facilities and businesses all day, it happens and we all know that. I think you just got a bad piston from the factory.

Hyperutectic pistons don't like detonation, not at all. On any higher hp application with detonation and those pistons, it can only mean one thing, trouble. I have a friend with a stock bottom end 93' with a single turbo, heads, and intake, better fuel system, and a good tune. The car made 411 rwhp and over 500 ft/lbs of torque. Currently he's upgrading again and going looking to run around 500 rwhp, all on the stock hyperutectic pistons. How long will it stay together, who knows, but it's been running the 400 for over 3 years.

As far as the Ford Techs/Mechanics go, well I had a 99 GT in for some work. When I went to pick it up I asked to talk to the guy and we were discussing some problems I was begining to have with the clutch. They had my car for two days, with this guy doing all the work, when I said something about maybe something in the clutch cable stretching, his reply was "A mustang has a hydraulic clutch, so there is no cable to stretch". I argued with him for a few minutes and finally told him to go out and check my car and then come back and tell me. After about 5 mins he came back and still couldn't tell me one way or the other. The point of the story is, most (not all) Ford techs/mechanics are good for changing oil, not tearing down motors.