Not Ranked
You don't want to build a stroker (either a 331 or 347) and then kill it's performance potential by putting poor flowing heads on it - that's the whole reason for stroking the motor. There are SO many good heads out there for that application -AFR, Trick Flow, Brodix. A set of AFR 165's are perfect for a 331 - that's what I have on my Keith Craft 331. Plenty of power, great on the street, really nice sound.
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