Dual-Feed Carb Inlet Kits — Holley 4150/4160/4500 & Ultra XP (Black)
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Dual-Feed Carb Inlet Kits — Holley 4150/4160/4500 & Ultra XP (Black)
Clean, reliable fuel delivery for performance carburetors. These pre-made dual-feed kits match the common Holley bowl thread and center-to-center spacing for 4150, 4160, and 4500 (Dominator) carbs, plus a dedicated variant for Holley Ultra XP. All variants include a 1/8" NPT gauge port in the T-fitting and arrive in a black finish to blend with modern engine bays.
Choose your variant
Holley 4150 dual-inlet — 9.3" C-to-C
Inlet size: -8 AN • Bowl thread: 7/8"-20
Best for: 4150/4150 HP dual-inlet bowls.
Holley 4160 dual-inlet — 8.8" C-to-C
Inlet size: -6 AN • Bowl thread: 7/8"-20
Best for: 4160 dual-inlet spacing.
Holley 4500 (Dominator) — 11.35" C-to-C
Inlet size: -8 AN • Bowl thread: 7/8"-20
Best for: 4500/Dominator dual-inlet bowls.
Holley Ultra XP
Inlet size: -8 AN • Bowl ports: -8 ORB (3/4-16)
Best for: Ultra XP bowls with ORB inlets.
Why builders choose this kit
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Direct fit: Pre-spaced to known Holley center-to-center dimensions for clean routing.
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Gauge-ready: 1/8" NPT port in the T-block for an inline fuel pressure gauge or sensor.
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High-flow: -6 or -8 AN feed sized to your combo.
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All black: Black hose and fittings for a stealth, unified look.
Specs
| Variant |
Center-to-Center |
Feed Inlet |
Carb Bowl Connection |
Gauge Port |
Finish |
| Holley 4150 |
9.3" |
-8 AN male |
7/8"-20 male fittings to bowls |
1/8" NPT (in T-block) |
Black |
| Holley 4160 |
8.8" |
-6 AN male |
7/8"-20 male fittings to bowls |
1/8" NPT (in T-block) |
Black |
| Holley 4500 (Dominator) |
11.35" |
-8 AN male |
7/8"-20 male fittings to bowls |
1/8" NPT (in T-block) |
Black |
| Holley Ultra XP |
Model-specific |
-8 AN male |
-8 ORB (3/4-16) to bowls |
1/8" NPT (in T-block) |
Black |
Install notes
- Verify your carb model and measure bowl center-to-center distance before ordering.
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NPT vs. AN/ORB: Use fuel-rated PTFE paste on NPT threads only. Do not use sealant on AN flares or ORB O-ring threads.
- Route away from heat and moving parts; support the line to prevent vibration.
Popular add-ons
What’s included
- Pre-assembled dual-feed crossover hose with -6 or -8 AN inlet.
- (2) Carb bowl fittings (7/8"-20 or -8 ORB for Ultra XP).
- T-fitting with 1/8" NPT gauge port.
Fitment confirmation: 4150 = 9.3" C-to-C, 4160 = 8.8", 4500 = 11.35"; Ultra XP uses -8 ORB bowl ports. Verify before ordering.
