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Originally Posted by 86MonteSS
not sure what kinda springs are on it....the heads were bought how they are....they came off an 1/8 mile dragster.....they have been ran for 3 seasons on his car..... unknown how long on the dragster
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Well, if it were my engine, I would def. change the valve springs before it the engine ever turned over again. Also, I'd have the valves checked (make sure none are bent), valve seats, valve guides, and have air flow checked.
Three years is along time to go without doing all of what I said, and if your friend isn't careful, he'll wind up having a valve spring fail, and cuase a piston to get into a valve(s) and ruin a good engine. Most of the time when a piston gets into a valve (because of a valve spring) the valve winds up broke, and shoved through the heads, lol, a piston is destroyed, and a cylinder wall is busted.
We have new springs and all of what I said above checked after every year (exception for this year, becuase the engine in the car is brand new, and only has maybe 12 weekends on it this year.). Now next year, I'll probably swap engines to another 406 we have that has just been freshley overhauled (even has a new intake). I think all it needs is lifters and a carb and it would be complete, and then have the heads on the engine in the car freshened, since the rest of the engine is practically brand new.