Here's a breakdown of your codes from Xfalcon (go down a few posts) http://www.xfalcon.com/forums/index.php?/topic/1192-code-breaking-your-motor/page-7 The 4K means body configuration. Yours is an F100 4x4. K on the end of the engine/chassis number just means V8. So it's a locally made 351C out of an imported F-series CKD kit. Sent from my CPH1903 using Tapatalk