One was taken apart after rocker arm broke on my race car to do a complete rebuild, about 90K miles plus 2 seasons of autocross.
Another I took apart planning to do a stock rebuild but went ahead with used head from different motor for a street car. About 140k miles. Nothing was wrong with the head.
Another I took apart planning to do a stock rebuild but went ahead with used head from different motor for a street car. About 140k miles. Nothing was wrong with the head.
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