These valve springs are much stiffer than stock and are a direct fit. No modifications need to be done for them to fit. 
https://www.benzinjection.com/....product-page/copy-of
		
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									These valve springs are much stiffer than stock and are a direct fit. No modifications need to be done for them to fit. 
https://www.benzinjection.com/....product-page/copy-of