Updated modular heads, what build dates?
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Lead Driver
Joined: Sep 2002
Posts: 9,573
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From: North Texas
Updated modular heads, what build dates?
I have a lead on a crapped out '03 Screw. I have read that around late '02 to early '03 Ford did the design change to eight thread heads on the 4.6/5.4...does anyone know via a TSB or dealer work when this change occurred?
My truck is an '01 Screw 5.4/70W
Thanks
My truck is an '01 Screw 5.4/70W
Thanks
Fleet Mechanic
Joined: Jul 2019
Posts: 1,323
Likes: 314
Supposedly, early ‘03 was when the eight thread heads went into production.
What does that get you? Really, nothing. It’s a random crapshoot at that point what you got as far as threads go.
https://www.lightningrodder.com/thre...-heads.109270/
What does that get you? Really, nothing. It’s a random crapshoot at that point what you got as far as threads go.
https://www.lightningrodder.com/thre...-heads.109270/
More Turbo
Joined: Mar 2009
Posts: 532
Likes: 92
‘03 was the change over
had one truck come in the shop had four thread head on one side and an eight thread head on the other
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Lead Driver
Joined: Sep 2002
Posts: 9,573
Likes: 2,037
From: North Texas
My Screw has some issue on No 4, I have yet to do a full diag but it skips when cranking if you listen close. Either No 4 is low compression or torched valve, both of which are odd for these mills. Looks to be about $400 OTD for the long block.
Either way thanks for the heads up...pun intended.
Either way thanks for the heads up...pun intended.
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Born2DriveFords
1997 - 2003 F150
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Dec 21, 2005 09:54 AM
