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I have 2 1/2 inch spacers (1 in) Will these spacers kill my top end a little ?? I need all the top end I can get I have a stock cam with 4.10. What should I do the whole 1 inch, 1/2 inch or nothing. Quick anserws please I am doing the intake tomarrow thanks.
 

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What other mods do you have ? Those two spacers should kill your performance up top. If you have stock intake,heads, and cam you shouldnt be going over 5,000 rpm BTW.
 
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