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Discussion Starter #1
I've got a 91 with a p-pump that already has 3K springs in it, i was wondering who has put a set of 4k springs in running the stock head parts and stock rods??
 
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Lots of people including myself are running 4k springs with stock internals. The only must is you have to change the valve springs to HD 60lbs springs. Other than that the rods, bearings, etc will be fine. Remember just because you put 4k springs in does not atuomatically mean you are going to turn 4k. You still must have the proper combinations of fuel, timing, and air to achieve the 4k. Right now I can only turn about 36oo myself.
 

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Discussion Starter #3
okay, i have 3k in it now and it turns 3200
 
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