400 with D1 heads?
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Joined: Mar 2006
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From: Morganton, NC
400 with D1 heads?
I have a truck that needs valve springs. I took the heads off, and the casting number starts with D1. This is in a 79 F-250, so I assume they have been swapped. How much more power can the 71 heads make over a 73+ head? I'm looking at: 400CID D1 heads edelbrock performer 400 .485/.510 218/224 on a 110 lsa cam edelbrock 600 carb
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Joined: Jul 2007
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there is an advantage and disadvantage. Combustion chamber are different but nothing helpful. On the good side you probably don't have the port belly from the exhaust crossover which restricts a lot the exhaust ports starting on 73 I think.. on the negative side , if the fellow who installed those set of heads didn't install hardened seats to withstand unleaded fuel better never ran it lean, and those are prone to cracking...
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