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i have rebuilt 7 of theese engines in the last 7 months. there is a definitte problem with cam followers in theese engines, but this is not the main problem with the engines. The cylender walls become scuffed by poor quality pistons from factory. I have as mentioned have rebuilt severall of theese engines with no problems, with much less cost than Porsche,,, 10 grand our end...20 or more from Porsche . ..