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426 cylinder heads
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Kevin210 View Drop Down
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Joined: 08 Oct 2018
Location: Indiana
Points: 428 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Kevin210 Quote  Post ReplyReply Direct Link To This Post Topic: 426 cylinder heads
    Posted: 16 Apr 2023 at 12:38pm
Is there any difference between a head off of a 3500 engine compared to a 3700 engine,just curious.There is a reason behind why i would like to know but it's embarrassing LOL.

Thanks..
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21996 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2023 at 12:47pm
If the casting numbers are the same, they are the same. There was a time in late 1974 and maybe thru 1975 that a 7080 had a different casting number than the lower HP 7040/7060 engines being built on the same day. The 7080 head had .100" more iron in it on the bottom deck for durability. As time went on, all 426 engines received the newer/thicker head regardless of HP output. 
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Kevin210 View Drop Down
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Points: 428 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Kevin210 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2023 at 1:00pm
Thanks Doc.
What I did was used the head off my 3500 engine
and put it on a MK II 3700 engine...
So this is somewhat hind sight I guess you could say..
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DrAllis View Drop Down
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Points: 21996 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2023 at 1:29pm
Well, there are 3500 heads from 1966 and 3500 Mark 2 heads from 1973 and 1985. Newer casting numbers usually yielded durability improvements.
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