difference in heads-early 400-425

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Aug 11, 2012 | 07:56 AM

therobski

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Joined: Jul 2009

Posts: 3,191

From: Dallas-Fort Worth

difference in heads-early 400-425

Is the early 400 and 425 heads the same in terms of valve size, port size, rated spring pressure etc?

Aug 11, 2012 | 05:54 PM

cutlassefi

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Joined: Nov 2008

Posts: 8,487

From: Central Fl

Apples to apples most all of the big block heads have similar flow.

Aug 11, 2012 | 06:12 PM

Octania

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Joined: Dec 2011

Posts: 7,286

Toronados always had the best parts. Big valve heads for example.

442's generally sported big valve heads also.

Not huge differences, but not negligible either.

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