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The title says 1969 Spit, but the commission plate says April 1, 1968. is this possible?
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I think you're talking here of the Spitfire (not GT6) body? Do you have a commission number on the plate? Seems a stretch to call it a '69. If it was made in late-68 (say October), then it may well have been sold as a 1969 model. It would be a Spifire Mk3, which was made up to December '70. A commission number would help nail it down.
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More important to this post, is the question of engine identification. can anyone identify the year for this engine block# KE12476UE ??
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This engine number seems unusual to me. The KE-prefix engines were 9.25:1 compression ratio for the GT6 Mk3. About 13,000 Mk3's were built between October '70 and December '73. I have no idea what the starting serial number was, so I can't help much in placing which specific year for you, but it may not vary all that much.
The part I'm confused about is the "UE" on the end. Usually that means "USA Engine". But the US-imported Mk3's suposedly had a de-tuned engine (8:1 ratio), and had a "KF" prefix, not "KE".
Can you check and see if the carb(s) have a small brass tag on them, screwed under one of the corner screws right in top of the carb. If you can see the code stamped on the brass tag, that could help identify the specific year.
Also, Spitfire distributors (Lucas ones) have an embossed set of numbers on the side, indicating the dizzy model and then an arrow (-->) pointing to another set of numbers which indicate the year and week of manufacture. Check and see if you have either of these indicators.