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Iron D-Port Heads All iron d-port heads, flow number and performance results

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Old 01-20-14, 01:31PM   #1
shepherd1
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Default 4x

I just picked up a set of 4x heads for free, anyone know if 4x heads are good.
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Old 01-20-14, 06:41PM   #2
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God I can't remember but I think their a 350 head, with small valves. Not 100% in that, or a 428 head.
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Old 01-22-14, 12:43AM   #3
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Thanks I've got a couple different sets to pick pick from 4x, 670's, 51's.
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Old 01-23-14, 07:07PM   #4
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They used 4X heads on both 400s and 455s. Most are big valve but they also made small valve 4X heads. Screw in studs=big valve heads.
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Old 01-23-14, 11:15PM   #5
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The 400 heads were around 98 cc and the 455 heads were around 114 cc
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Old 01-23-14, 11:17PM   #6
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Yeah just trying to figure out which heads I want to use. They all are big valve heads, gonna be used on a turbo motor.
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