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If you have to ask....W-2s. But personally I'd just refresh and mild port what you have. If your doing a bottom end build which you aren't doing then feel free to get a nice set of heads. It'll just never be what it could or should be the way it stands now. Get some compression into it and then go head crazy.

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I thought was the reason for putting the mag heads on the LA motors, a bump in compression, better flow, quench