HS40 Tecumseh springs #31672 in a clone?

#1
I don't remember how I stumbled on it but found an old post recommending the HS40 tecumseh valve springs part #31672. Any one use these in there clone and are they a direct drop in. I like to frankenstein my motors. Are there any other factory springs that work besides the GX140 for higher RPM than stock?
 
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