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Need new heads..which ones?

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Hey guys! With 320k on it, my valvetrain is pretty tired. It's chattery and #2 has a bit of a tick, and makes a nasty maraca noise on cold starts (sub 40 degrees). I was just going to pick up a set of used heads and throw on once it warms up, which leads me to my questions.


As far as performance, would 4.8, 5.3, or 6.0 heads be better? The truck has a 4.8 in it right now.. I don't want to retune whichever route I go with BTW. Thank you!

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