HOLLEY Carburetor, Model 4150, Ultra XP, 4-Barrel, 650 CFM, Square Bore, No Choke, Mechanical Secondary, Dual Inlet, Black Anodized, Each

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HOLLEY Carburetor, Model 4150, Ultra XP, 4-Barrel, 650 CFM, Square Bore, No Choke, Mechanical Secondary, Dual Inlet, Black Anodized, Each

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    Market price: $1199.99, you save $138.00
  • $1061.99
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  • Shipping info

    We deliver worldwide and to almost all countries. Call us at 704-871-0721 to get help with large international orders and we can help manually check the shipping for you. MORE INFO BELOW in Shipping Info section.

  • Payment methods

    Accepted payment methods

  • Return Policy

    We accept returns for up to 30 days from the purchase date. To be eligible for a return, your item must be unused and in the same condition that you received it. More Return Info below. 

Competition-proven, all-aluminum carburetors are 4.5 lbs. lighter than traditional units. Gasoline 4bbl carburetors include mechanical secondaries, dual 30cc accelerator pumps, 20% more fuel bowl capacity, clear-view sight windows, four-corner idle system, and adjustable secondary link that allows 1:1 or progressive throttle activation. All carburetors feature hard-core gray finish with black anodized metering blocks and booster inserts.

Product Line

Ultra XP




650 CFM

Fuel Type


Secondary Style


Fuel Inlets


Inlet Distance

9-3/4 in

Mounting Flange Style

Square Bore

Number of Barrels




Choke Type


Supercharger Calibration


Booster Style

Down Leg

Accelerator Pump


Accelerator Pump Primary

30 cc

Accelerator Pump Secondary

30 cc

Power Valve Size


Primary Jets


Secondary Jets


Seat Size

0.120 in

Primary Pump Nozzle

0.032 in

Secondary Pump Nozzle

0.032 in

Corner Idle Adjustment

4 Corner

Base Plate Material


Base Plate Color


Base Plate Finish


Main Body Material


Main Body Color


Main Body Finish


Metering Block Material


Metering Block Color


Metering Block Finish


Fuel Bowl Material


Fuel Bowl Color


Fuel Bowl Finish




    • Weight
      9.53 lbs
    • SKU
  • Manufacturer

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Products typically ship out between the same day and 1-3 days. Depending on the time/day ordered and the product type. Some products are made to order to spec and will ship once built. Feel free to call us at 704-871-0721 if you have any questions about shipping. Also call us if you are ordering large items like race car bodies as those are hard for the freight system to calculate sometimes and it will overestimate. Thank you.

We accept the following payment methods:

Accepted payment methods

And now Venmo & PayPay Credit

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately, we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. If the return is not based on a mistake on our part, a 15% restocking fee will apply.

Several types of goods are exempt from being returned. We also do not accept products that are hazardous materials, flammable liquids, or gases.

Additional non-returnable items:
* Gift cards
* Downloadable software products

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer. *Special cases might be returned to the manufacturer*

There are certain situations where only partial refunds are granted: (if applicable)
* Book with obvious signs of use
* Any item not in its original condition, that is damaged, or is missing parts for reasons not due to our error.
* Any item that is returned more than 30 days after delivery

Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next, contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at glnmaurer@circletracksupply.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately, sale items cannot be refunded.

Exchanges (if applicable)
We only replace items if they are defective or damaged, or if we made the mistake.  If you need to exchange it for the same item, send us an email at glnmaurer@circletracksupply.com and send your item to 304 5th Creek Road, Statesville, NC, 28625, United States.

To return your product, you should mail your product to:

304 5th Creek Road, Statesville, NC, 28625, United States.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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