Not Ranked
What are you gonna put them on. Let me rephrase that....they will fit on any small block. 289,302,351 windsor.
Other than that figuring out what they came off of dont really matter. What matters is what are you trying to do? If you looking to make more power than you need to know what they flow.
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" If it wont break em loose in 3rd gear, it aint enough power "
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