Cryptic crossword clue
Type of engine in Ford model Triumph briefly advanced 4-3

The most common and most likely answer to this crossword clue is the 8 letter word TWIN-CAM

I've seen this crossword clue in Independent
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The straight part
We know that "Type of engine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of engine = twin-cam.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

TWIN-CAM noun
  1. A type of sports car engine that has two overhead camshafts within the cylinder head, resulting in more horsepower than a standard single cam engine.

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