60lb valve spring limit

qssc

qssc

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Sep 22, 2008
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When are 60lb valve springs not enough spring for a 12v. They seem to the most common upgrade but there are other options out there. Is it determined by boost? rpm? What draws the line when say you need to from a 60lb spring to a 150lb?
 
Say I ran a stock cam, what rpm do they need to be bigger? I have a 215 pump with 5k gsk. Just figuring our what would be best option when I assemble engine
 
Ive heard many people say 4k rpm is the limit with them but then again tons of people run over 4k without issues including myself. I would say the locks will pull through the retainers before you have a spring issue
 
60 lb does not mean 60 lbs...it means 60 lbs over stock, right?

Does 150 lb mean 150? ...or does it mean 150# over stock?
 
Correct, the 60# is around 155lb on the seat Stock is around 95lb on the seat.
 
ENafziger said:
60 lb does not mean 60 lbs...it means 60 lbs over stock, right?

Does 150 lb mean 150? ...or does it mean 150# over stock?
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IIRC, the 60 lbs. designation was for the exhaust valves with an exhaust brake, they would hold back 60 psi of back pressure without blowing open.
 
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