Hi lariet
I'm not sure 98 had the 4 cammer but that is a buy on any 5.4.

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97 Lariet-sc-4.6-4x off road-auto-3.55 LS-
superchip-K&N-3"
pvc air box mod-Granetelli MAF

 

That ain't no DOHC 5.4!

 

Lincoln offer both the 2v SOHC and 4v DOHC 5.4L engines in their Navigator. The engine on Ebay is a 2v SOHC.

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1999 F250 LD S/C XLT 4x4
5.4L, 3.73, 4R100 trans.
Flowmaster 40 "DF" series, K&N, Superchip, WMS Velocity Tube, Rancho RSX shocks, Hellwig rear swaybar, Stull billet grille, 2-PIAA Pro80XT's (120W), 2-KC Daylighters (150W), Clear Side Lens Mod w/ 9006 (55W bulbs). 265/70 R17 BFG AT KO's on 17x8 American Racing Atlas rims
Kenwood 7007 CD, Alpine 3342 Signal Processor, Alpine MRV-F353 5Ch. Amp, Pioneer TS-A6865 3-way speakers, MTX Thunderforms. CompuStar alarm/autostart. On the way: Performance Accessories 3" body lift, 33/12.5/17 ProComps, GSP grille guard and more KC's

 

I found this while browsing for HiPerf parts... for any of you that may be interested in the DOHC 5.4L, this is a good deal. As long as the piston slap thing isn't a problem. It may still be under some sort of warranty too.

http://cgi.ebay.com/ebaymotors/aw-cg...857395&r=0&t=0