I just looked up some valve springs through Summit and you're right, we can pick some up for around $50. So I say we at least clean up the stock heads we have (mild porting by me), install new springs and valve stem seals and install the cam we already purchased. That will extend our powerband from 4000 rpms up to 5500 rpms.
As soon as I have the Explorer done I'll pull the heads and see what kind of shape the engine is in.
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