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Your cart is empty.Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy Nascar Cup team and nearly every NHRA Pro–Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies we can give you the edge you need over the competition!
james siemion
2025-08-30 10:05:03
arrived in a timely manner, and worked as expected.
Charlie Dawson
2025-07-28 17:18:40
nice
franc vasi
2025-07-26 13:18:02
Works great, fit is perfect. Eliminated the rough idle on the 1967 el Camino.
Rock
2025-07-16 11:13:22
They work great.
Jose Salguero
2025-07-01 18:57:25
Fast shipping and just what I need itIt comes on Holley packaging and it did the job !I was having rough idle and leaking from throttle shaft , also count get the right level of gas on the float . Before I go taking the carburetor apart I said let me change this needles and see .So far no leaks and smooth idle .Also I was getting rough starts, now starts right away .Thank you happy camper
Ed Bird
2025-06-20 10:21:38
I liked the availability at a great price. Bought for a 1984 F250 4x4 with a 460 and Holley 4180.
Jim Valentine
2025-06-08 17:03:00
Great product
Hector Ochoa JR
2025-06-06 14:00:52
I purchased this Holley 6-504 Inlet Needle 0.110 to replace the one from my Holley 670 CFM Street Avenger. Comparing the 2, the OEM has an "H" stamped on it to identify it as a Holley part. The replacement part didn't have this. Not sure if that implies it is not an original Holley part. Also, it did not come in any Holley packaging. It came in a zip lock baggy. Either way, it worked as expected and got me back on the track.
Bob Bridges
2025-04-21 19:36:07
This was the solution to my problem of a flooding Holley. It worked great and took minutes to install.
james siemion
2025-04-16 16:09:25
arrived in a timely manner, and worked as expected.
Charlie Dawson
2025-04-14 17:19:22
nice
franc vasi
2025-03-20 11:01:04
Works great, fit is perfect. Eliminated the rough idle on the 1967 el Camino.
Rock
2025-03-13 14:09:43
They work great.
Jose Salguero
2025-03-04 10:08:03
Fast shipping and just what I need itIt comes on Holley packaging and it did the job !I was having rough idle and leaking from throttle shaft , also count get the right level of gas on the float . Before I go taking the carburetor apart I said let me change this needles and see .So far no leaks and smooth idle .Also I was getting rough starts, now starts right away .Thank you happy camper
Ed Bird
2025-01-31 15:15:15
I liked the availability at a great price. Bought for a 1984 F250 4x4 with a 460 and Holley 4180.
Jim Valentine
2025-01-26 15:55:27
Great product
Hector Ochoa JR
2025-01-14 15:06:06
I purchased this Holley 6-504 Inlet Needle 0.110 to replace the one from my Holley 670 CFM Street Avenger. Comparing the 2, the OEM has an "H" stamped on it to identify it as a Holley part. The replacement part didn't have this. Not sure if that implies it is not an original Holley part. Also, it did not come in any Holley packaging. It came in a zip lock baggy. Either way, it worked as expected and got me back on the track.
Bob Bridges
2024-12-23 20:52:38
This was the solution to my problem of a flooding Holley. It worked great and took minutes to install.
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