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1968 390 heads

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gnrand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrand Quote  Post ReplyReply Direct Link To This Post Topic: 1968 390 heads
    Posted: Feb/12/2020 at 8:21am
Is there an easy way to determine if my 390 heads are stock or "Dog leg".
Thank you
Jeff
1968 AMX X
1986 Buick GN
1965 Corvair Corsa
1966 V8 Corvair
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bbgjc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbgjc Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 8:52am
The exhaust ports are rectangular on early heads. From 70 up they look like boots/doglegs

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White70JavelinSST View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote White70JavelinSST Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 9:21am
Dogleg exhaust port looks like this





Edited by White70JavelinSST - Feb/12/2020 at 9:23am
70 Javelin SST, second owner, purchased 1972
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AMXFSTBK390 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXFSTBK390 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 11:41am
Pull a valve cove and post the casting number, or look it up yourself.
The most powerful tool is the question.
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Heavy 488 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 12:00pm
If it still has manifolds, you can make out the shape at the head mounting flange.
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gnrand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrand Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 8:31pm
Maybe this pic will help.

1968 AMX X
1986 Buick GN
1965 Corvair Corsa
1966 V8 Corvair
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMXFSTBK390 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 9:09pm
How do you know the heads are not 290 or 304 heads without pulling the valve covers?
The most powerful tool is the question.
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Heavy 488 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 9:32pm
Looks like square port to me at least compared to the log manifolds on my 70.
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gnrand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrand Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 9:40pm
OK, I have some minor surgery tomorrow but should be able to pull the valve cover and snap a picture.
1968 AMX X
1986 Buick GN
1965 Corvair Corsa
1966 V8 Corvair
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gnrand View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gnrand Quote  Post ReplyReply Direct Link To This Post Posted: Feb/12/2020 at 10:15pm
Got ambitious and pulled the pass side valve cover. The number is 3188558-2. Looking it up it is a 68/69 AMX and it has rectangular exhaust ports, if I am reading it correctly.
Jeff
1968 AMX X
1986 Buick GN
1965 Corvair Corsa
1966 V8 Corvair
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