max rpm on stock valve springs

T

tbggreddy

Member +
hi, what's the maximum rpm we can run on the stock 4efte head (slight port and polish done, aem standalone management, garret 2860, forged internals)?
 
G

GP82

Member +
It can spin up high, but 7 - 7200 rpm, i've seen them at 8k + but how stable do you think the valve train will remain. It will start bouncing the valves and reduce cylinder pressure then loose power.
 
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