6400 chip rule the springs will last as long as the engine
we have our late model customers turning 7000 (NOT recommended) but they do------and we will commonly put the same springs right back on after 40 to 50 races when they come in for freshen
we HIGHLY recommend pulling the valve covers weekly ---no matter what RPM you run and inspecticting the keepers and top coil of the valve spring----visually look over everything ---NO need to take anything apart or make any adjustments just look for things that don't look the same
The blue bee hive spring currently used on the 604 is designed for---
more lift than what we use
same valve weight as what we use
more RPM than what we use
so that leaves us with heat-----
heat is the enemy of many engine components including valve springs
in "most" cases if we created enough heat to hurt the springs something else will show its ugly face first
I think that will make them MORE likely to have a failure
once those keepers get locked onto the valve they want to stay put----busting them loose every 10 races is only going to cause them to crack and I'll bet that they are NOT replacing keepers every 10 races as the cost is $5 EACH not a pair but EACH---that's $160 for a set and that is dealer cost not retail
we are working with GM to get that price adjusted but as with anything in a big company it takes time
correct, that to me seems like recipe for failure! I would not want to touch mine unless mandatory.
That is why the guys that actually ask me directly, I tell them what you've told me and refer them to you if they don't believe me and I explain to them that you've dealt with hundreds of these engines vs shops around here who have just started seeing them the last two years
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