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1968 390 heads |
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gnrand 
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Joined: May/25/2016 Location: Az. Status: Offline Points: 174 |
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 Topic: 1968 390 headsPosted: Feb/12/2020 at 8:21am |
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Is there an easy way to determine if my 390 heads are stock or "Dog leg".
Thank you Jeff |
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1968 AMX
1986 Buick GN 1965 Corvair Corsa 1966 V8 Corvair 1969 Scrambler Stock 1969 Scrambler Modified |
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bbgjc
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Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1660 |
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Posted: Feb/12/2020 at 8:52am |
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The exhaust ports are rectangular on early heads. From 70 up they look like boots/doglegs
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White70JavelinSST
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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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Posted: Feb/12/2020 at 9:21am |
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Dogleg exhaust port looks like this  Edited by White70JavelinSST - Feb/12/2020 at 9:23am |
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70 Javelin SST, second owner, purchased 1972
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AMXFSTBK390
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Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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Posted: Feb/12/2020 at 11:41am |
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Pull a valve cove and post the casting number, or look it up yourself.
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Questions are powerful tools...what's in your toolbox?
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Heavy 488
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Posted: Feb/12/2020 at 12:00pm |
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If it still has manifolds, you can make out the shape at the head mounting flange.
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gnrand
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Joined: May/25/2016 Location: Az. Status: Offline Points: 174 |
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Posted: Feb/12/2020 at 8:31pm |
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Maybe this pic will help.
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1968 AMX
1986 Buick GN 1965 Corvair Corsa 1966 V8 Corvair 1969 Scrambler Stock 1969 Scrambler Modified |
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AMXFSTBK390
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Posted: Feb/12/2020 at 9:09pm |
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How do you know the heads are not 290 or 304 heads without pulling the valve covers?
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Questions are powerful tools...what's in your toolbox?
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Heavy 488
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Posted: Feb/12/2020 at 9:32pm |
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Looks like square port to me at least compared to the log manifolds on my 70.
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gnrand
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Posted: Feb/12/2020 at 9:40pm |
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OK, I have some minor surgery tomorrow but should be able to pull the valve cover and snap a picture.
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1968 AMX
1986 Buick GN 1965 Corvair Corsa 1966 V8 Corvair 1969 Scrambler Stock 1969 Scrambler Modified |
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gnrand
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Joined: May/25/2016 Location: Az. Status: Offline Points: 174 |
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Posted: Feb/12/2020 at 10:15pm |
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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 |
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1968 AMX
1986 Buick GN 1965 Corvair Corsa 1966 V8 Corvair 1969 Scrambler Stock 1969 Scrambler Modified |
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