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Message: <blockquote data-quote="sdhow" data-source="post: 23303" data-attributes="member: 8099">Got a new OE injector online, but I'm having a bear of a time getting the injector rails back in place. Read somewhere that GM actually changed the head design to add a groove at the bottom of the injector port to allow for tip insertion. Is this true? If so, how do you get the injector back into the port on the earlier models? I was looking at the factory shop manual...says "Remove head assembly"...<img class="smilie smilie--emoji" loading="lazy" alt="😖" title="Confounded face    :confounded:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f616.png" data-shortname=":confounded:" /></blockquote>