I have the stock lifters and rev to 6500 every time I race but have tried to go past that once or twice to 7000 rpm's and I think I am limited by my cam and intake but I dies over 6600. I did hit 7000 but it had no power.
BTW: I have a carb setup.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft