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Discussion Starter #1
i am doing a 12 valve swap in my 1979 f-250 and i was wanting to know the best or "perfered" performance parts to add to the 12 valve for about 500rwhp. i have owned powerstrokes in the past and produced 500 with chips and intakes and oil pumps with propane....but i am not very familar with the cummins 12v. need help please...
 
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