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Old Aug 28, 2025 | 09:41 PM
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Default Intake manifold

Using a Chinese 300-137 Holley style EFI intake and using 12580681 truck injectors. I bought the extension adapters, do I keep the plastic spacer on the end of the bottom of the injector or remove it? One picture is with it on and one without. The one with the spacer looks like the injector is too far up in the manifold.




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Old Aug 28, 2025 | 11:00 PM
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Keep the plastic spacer on. It is a necessary insulator that protects the injector from engine heat. The installed height is correct.
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Old Aug 29, 2025 | 06:28 AM
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Originally Posted by Robbi18
Keep the plastic spacer on. It is a necessary insulator that protects the injector from engine heat. The installed height is correct.
Thank you
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Old Aug 29, 2025 | 07:11 AM
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It's just an o-ring retainer, look up "pintle cap" for more information.

The spacing looks fine running it with or without.
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