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12-27-2011, 12:06 PM | #1 |
Valve bender backer
Join Date: Mar 2011
Location: Orlando
Posts: 380
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Video of 4V exhaust seat moving in the head
Common problem with the 03 and newer 4V heads that are under a lot of boost. The seats get overheated and will loosen from the heads. You can click on the first link to see the gap between the seat and the head, and the second link shows a video of the seat spinning in the bore when the valve job tooling hits it. 6 seats in this pair of heads were like this, all are being replaced.
4V exhaust seat falling out http://www.youtube.com/watch?v=ObT2WAfhvM8 |
12-27-2011, 12:25 PM | #2 |
Torque wins!
Join Date: Dec 2004
Location: Florida
Posts: 13,167
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Re: Video of 4V exhaust seat moving in the head
Holy crap!
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12-27-2011, 12:27 PM | #3 |
finally paid for
Join Date: Nov 2004
Location: Ypsilanti Twp, Mi
Posts: 4,077
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Re: Video of 4V exhaust seat moving in the head
WOW...that is something!
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2004 mach 1-turbo build in progress.. Fast xfi 2.0 OLD combo- 826rwhp/720 trq -100 shot NX 9.13@154 on 100 shot NEW- in progress... |
12-27-2011, 01:31 PM | #4 |
Registered User
Join Date: Sep 2009
Location: Plantersville, TX
Posts: 354
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Saw this on ModFords crazy seem a lot of these heads actually drop seats.
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12-27-2011, 01:34 PM | #5 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
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Re: Video of 4V exhaust seat moving in the head
holy crap!
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
12-27-2011, 02:12 PM | #6 |
8LB YNER
Join Date: Mar 2005
Location: Tampa
Posts: 5,661
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Re: Video of 4V exhaust seat moving in the head
My greatest fear with these heads...
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12-27-2011, 02:54 PM | #7 |
Valve bender backer
Join Date: Mar 2011
Location: Orlando
Posts: 380
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Re: Video of 4V exhaust seat moving in the head
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12-27-2011, 03:29 PM | #8 |
Dark Knight
Join Date: Nov 2009
Location: Albuquerque, NM
Posts: 5,759
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Re: Video of 4V exhaust seat moving in the head
My buddies 3.4 Whipple Cobra had an exhaust seat drop on the dyno. Didn't fall all the way out and grenade the motor, but the tuner said another pull and it probably would have. He ended up just replacing the heads with stage 2 livernois.
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Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage |
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