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Old 04-23-2009, 04:16 PM
454C10 454C10 is offline
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270H has 224/224 at 0.050"

260H has 212/212 at 0.050"

Dart or AFR heads will easily out power stock gm heads of that time period. Porting stock heads makes no sense unless you do it yourself. And I don't think the guy in a head porter. Just buy good heads and move on.
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