| The whole motor is bone stock with the exception of valve springs. The heads are ported very mildly to the extent that they might as well be stock. My car is driven hard almost every time I drive it. And this motor has been in the car for over a year. We just did a compression test and it came out A-OK. So take it from my experience, the only thing you have to worry about is: 1. Tuning 2. The quality of gas you run. Good luck. Zo
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