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Joined: May 2002
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Is there a difference in the bare heads? I have an SE with 12 bent valves and I plan on getting 3.0L valves for all 24 valves. Is it better to put the valves in a SVT head or is the SE head(not the cams, just bare head) the same?
98 SE Sport resonators removed, cone filter, custom catback, Intrax springs, Comp Euro T/A. 3.0L here waiting to go in. Just bent ALL the intake valves.
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Joined: Jun 2000
Posts: 3,248
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SVT heads have Extrude Honed intake ports so they are both smoother and slightly larger. But if you are doing your own porting anyway probably no difference.
1999 Amazon Green SVT Contour (#554/2760)
Stock SVT Duratec V6 with:
Intake- K&N filter/75mm MAF meter
Exhaust- MSDS Y-pipe/Bassani catback
Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter
179.2 FWHP at 6900 RPM
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Joined: Sep 2000
Posts: 248
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I was under the impression that the valve chambers were smaller in size on the SVT which made for the higher compression, which would mean shorter valves? I don't own an SVT so don't take my words as knowledge, but I do know that the SVT's run a higher compression, which is why the "Premium Fuel Only" appears on the SVT fuel gauge. If you run the wrong length valves, you are asking for worlds of problems. Check the info before you do this, because valve replacement is not one of those things you want to do more than once.
-Jeremy
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Joined: Jun 2001
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The compression change in the SVT was from "doming" the pistons. There are dimples for the valves in the tops.
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Joined: Mar 2001
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May I ask how many miles do you have and HOW in the world did you bend 12 valves ??
Pete... 98.5 SE Sport Duratec ATX (P66L) Black Clearcoat on Greystone DOB 11/21/1997 DOP 12/25/1997 PIAA 510 Super White Driving Lights SVT CAT-BACK EXHAUST (No Resonator) DiabloSport Chip (LPQ4) - Engineered To Raise Hell Too many other mods to list... Sounds sweet, runs quick... Crazy Horse Dyno @ 121.4 WHP/129.6 TQ
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Joined: Jul 2000
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Maybe overrevving? I don't know, just speaking out of the blue here.
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Originally posted by 1st 3L 95SE Wannabe:
Maybe overrevving? I don't know, just speaking out of the blue here. That's a HELL of a lot of valve float!!!  That is an odd thing for a Duratec. Maybe broken chain?
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Joined: Mar 2002
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Originally posted by Chris Hightower: Originally posted by 1st 3L 95SE Wannabe:
[b]Maybe overrevving? I don't know, just speaking out of the blue here.
That is an odd thing for a Duratec. Maybe broken chain?[/b]You'd think if the chain broke you might get a one or two valves before everyhting just stopped. To bend them all, now that's impressive. Did someone maybe put together an engine without reading the "mismatched timing mark" TSB???
97 SE MTX, KKM, UR UDP, 19# Injectors, SVT TB, SVT UIM, SVT Flywheel, Grizzly Street Clutch, Upgraded motor mounts, mystifed precats, brand new main cat, SVT exhaust sans resonator, 205-55-15 Dunlop SP5000's 154hp / 156 tq before the SVT exhaust, SVT dual honed upper and swapping the mystery main cat for mystery precats. My Profile
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Joined: Jun 2000
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It's actually pretty easy to jump the timing chain a tooth or two and smack all 12 valves. I've found quite a few like this in salvage yards. Usually, it's caused by a broken or faulty chain tensioner.
Brad Noon '99 SE MTX 3 point oh my God H.O. 179HP/178TQ BNMotorsports Floormats, powder coating, TB optimizing, Gutted cats, etc BNMotorsports is now the preferred distributor of Contour/SVT/Mystique Indiglo style gauges!!!bnmotorsports@msn.com
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Joined: Jan 2001
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The 3.0L valves will fit the 2.5L heads with out any problems. The overall length and the stem diameters are the same between the valves. I think all you need to do is bore out where the valve seats sit, and then open up the ports in the head to match. Everything else should be the same as a regular valve job. I bet you would use the same valve seats that the Taurus uses to. That would make the seats easy to find for the machine shop that is going to do the valve job.
Roger
98 SVT E0, Black
Blown motor, help on the way......
97 GTI VR6, Green
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