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Old Oct 17, 2006 | 11:19 PM
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chrono4
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Whats the safe rpm limits on these engines? Ive gota 78 with a 351m, 6000 on rebuild, decent cam but thats all. What should I be backing off at?
 
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Old Oct 17, 2006 | 11:25 PM
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drunknmudder77
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From: Subiaco, AR
I keep it under 4000 in my Bronco but have pulled a few 6000+ in mud holes & jumps. No problems out of the motor but did manage to move the crossmember back almost an inch from from hitting an almost a vertical hill.
 
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Old Oct 17, 2006 | 11:26 PM
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chrono4
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Ive been letting it shift bout 3500, 4000 under hard throttle, just wanted to make sure I was ok. Thanks.
 
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Old Oct 17, 2006 | 11:33 PM
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drunknmudder77
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From: Subiaco, AR
I know my buddy is turning atleast 6000 at the truck pulls, I wouldnt worry to much aslong as theres oil pressure. Ive heard from many old timers & read a few places that 10lbs for every 1000rpms you should be safe.
 
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Old Oct 18, 2006 | 07:55 AM
  #5  
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cruising down the highway, 3000 rpm im pushing about 65-75 psi, but at idle, it drop to 10-15.
 
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Old Oct 19, 2006 | 05:29 AM
  #6  
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dkstuck
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From: near pittsburgh pa
Crack them RPM'S up till you see dents in the hood!!! Then bring er down 100 rpm's!

That's a safe limit!
 
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Old Oct 19, 2006 | 10:34 PM
  #7  
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i take my truck with a 351m up too about 5500rpm with no problems yet.
 
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