Engine Quest EQ SB Chevy IMCA-Legal Cast Iron Cylinder Heads

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All EQ performance cylinder heads have AS-CAST combustion chambers, Dura-Bond exhaust seats, 3-angle valve job, thick deck surfaces for angle milling, phosphorus-bronze intake and exhaust guides, are machined for guide plate use, and feature raised intake runner ports for increased performance. Sold each.

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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. 

This head is engraved and serial numbered by Engine Quest for IMCAs Sport Mods, Stock Cars, and Hobby Stocks. Now approved for Wissota.

Product Line

IMCA Sport Mod

Assembled/Bare

Bare

Chamber Volume

76 cc

Plug Angle

Straight

Intake Runner Volume

176 cc

Exhaust Runner Volume

67 cc

Intake Port Shape

Rectangle

Intake Port Location

Stock

Intake Port Height

2.025 in

Intake Port Width

1.200 in

Exhaust Port Shape

Square

Exhaust Port Location

Stock

Exhaust Port Height

1.350 in

Exhaust Port Width

1.400 in

Exhaust Port Bolt Pattern

Stock

Intake Valve Size

1.940 in

Intake Valve Included

No

Exhaust Valve Size

1.500 in

Exhaust Valve Included

No

Valve Spring Included

No

Valve Seal Included

No

Rocker Studs Included

No

Pushrod Guide Plate Included

No

Valve Guide Included

Yes

Valve Guide Material

Cast

Center Mount Valve Cover

Yes

Valve Seat Included

Yes

Intake Valve Seat Material

Ductile Iron

Exhaust Valve Seat Material

Ductile Iron

Valve Seat Finish

Machined

Combustion Chamber Finish

As Cast

Intake Runner Finish

As Cast

Exhaust Runner Finish

As Cast

Intake Valve Angle

23 Degree

Exhaust Valve Angle

23 Degree

Accessory Bolt Holes

Drilled and Tapped

Material

Cast Iron

Color

Natural

Finish

Natural

Quantity

Each


AVAILABLE BARE OR COMPLETE-EACH
Assembled heads will include the following: 

  • 3/8" screw in studs # 915-99156
  • 76 cc combustion chamber
  • 176-178 cc intake runners
  • Straight plug
  • 1.94/1.50 intake/exhaust valves #910-14140-1 & 910-14145-1
  • Available bare or assembled and blue printed
  • Heavy duty valves
  • Retainers and locks # 915-39741 & 577-555
  • 1.25" high-performance valve springs # 180-671515
  • Three angle valve job

Item Details

Straight Plug
1.94/1.50 Intake Valves

    • Weight
      50.7 lbs
    • SKU
      ENQCH350I-XX
  • Manufacturer
    CIRCLE TRACK SUPPLY-PERFORMANCE AND RACE PRODUCTS, CTS
  • BARE OR COMPLETE-EACH
    BARE-ENQCH350I, COMPLETE-SWM9154622-COMP

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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.

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

CircleTrackSupply.com
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.