Performer RPM Small-Bore Cylinder Heads are engineered for use with 265, 283, 305 and 307 c.i.d. small-block Chevy engines produced from 1954-2003 with 3.736" to 4.000" bores. Can also be used with larger bore engines if desired. Unlike our other Performer RPM cylinder heads, the valve spacing has been reduced to 1.817" to accommodate the smaller bores. These cylinder heads have the same great features as every Performer RPM series cylinder head, such as a thick deck, extra thick port walls, high-flowing ports, ductile iron seats, and high-quality rocker studs. The Performer RPM Small-Bore cylinder heads feature state-of-the-art compact combustion chambers and highly efficient ports that offer improved performance throughout the rpm range for great throttle response. They retain the stock straight spark plug angle and exhaust flange bolt pattern for ease of use with factory style exhaust systems. These cylinder heads utilize the early Gen 1 (1959-86) valve cover bolt pattern. Like all Edelbrock cylinder heads, these have been designed, tested and cast from A356 aluminum and heat treated to T-6 specs in Edelbrock's facilities in Southern California to guarantee you get the best from a name you can trust. ** Combustion chamber volume 60cc; Intake runner volume 170cc; Exhaust runner volume 62cc; Intake valve diameter 1.91 in.; Exhaust valve diameter 1.50 in.; V stem diameter 5/16 in.; V guides Maganese Bronze; Deck thickness 9/16 in.; V spring diameter 1.46 in.; V spring maximum lift 0.600 in.; Rocker stud 3/8 in.; Guideplate Hardened steel; Pushrod dia 5/16 in.; V angle 23°; Exhaust port location Stock; Spark plug fitment 14mm x .750 reach, gasket seat. ** INSTALLATION NOTE: Check cam manufacturer's specs for compatibility with v springs for spring rates. Match with Edelbrock intake gasket #7201, exhaust gasket #7204, valve cover gasket #7549 and head gasket #7310.
Cyl Head Sbc 23 Deg Perf 170Cc Intake 60Cc Chamber Flat Tappet Cam Complete.
Edelbrock E-Force Supercharger part #15143 Supercharger systems without tuners are not eligible for supplemental warranty. Two 600 cfm Performer series Small block Chevrolet engine 302-400 C.I.D., 10 rib serpentine belt.
Chevrolet:Small-Block Gen I:302 (4.9L)/327 (5.4L)/350 (5.7L)/400 (6.6L)

SHIPPING POLICY

For US customers, we offer 3 shipping options:

• Free shipping for orders over $69. This shipping option takes 5-8 business days.
• Economy for small orders (less than 1lbs) $6.99
• This shipping option takes 5-8 business days. 
• Standard shipping (FedEx / UPS) for all orders $9.99 
• This shipping option takes 1-5 business days. 

We are currently unable to offer   overnight or 2-day guaranteed shipping .

This is because the warehouses of most of our suppliers only ship Ground.

Products ship from our Miami facility or drop ship direct from our Suppliers

Orders placed before 11am CST are typically will send the same day. 

Most orders placed after that time are will send the following business days. 

If you have specific shipping requests or needs please contact us at sales@bills-exhausts.com prior to purchasing and we will do our best to assist you.

If an item is back ordered from the manufacturer you will be notified by us. FYI – We don’t like it when this happens any more than you do.

We will try and help as best we can with back orders

A TRACKING NUMBER will be send to you via email or text after purchasing .

SHIPMENTS WITHIN THE U.S.

FREE STANDARD SHIPPING  on orders over $69 is available in all US lower 48 states, APO addresses, and Puerto Rico via USPS or UPS.  (*Exceptions apply for Alaska and Hawaii.)

Free standard shipping means we will select an option that gets you your parts as soon as possible while still being economically priced.

We reserve the right to deny free shipping for any reason.

About pre-orders:

When you order  PRE-ORDER it  means that you can purchase it before the official release date and then, you just wait for the shipping Usually pre-orders takes from 1-6 weeks depending the brand and the product. 

Contact us when ordering or we will contact you to go over rates and times.

INTERNATIONAL SHIPMENTS

WE SHIP WORLDWIDE Shipping rates outside the US are based upon destination and weight. 

Canada and Puerto Rico Fast shipping with DHL Prepaid Customs/Taxes (DDP)

•  Countries we don't collect  tax or duties required pay by you.

 (We cannot ship big size tires , oil ,batteries  and other heavy and big size items Internationally ONLY If you AGREE for LTL freight shipping, the final cost may differ from the amount shown at checkout due to additional fees.

We will contact you for confirmation before processing your order. )

If you have questions about these fees or duties contact us prior to ordering and we can assist you.

 -For international orders, customers who refuse the package will not receive a refund for the original shipping cost. Additionally, any return shipping fees incurred by us will be deducted from the customer's refund

 -Tires are not eligible for return.

 -Electronics are not eligible for return.

More for Return policy here

Delivery times for international shipments are typically 5 to 9 business days, but this can vary depending on your country’s customs procedures.

Orders delayed by customs are not something we can control or change.

ALL international orders(Includes CANADA and Puerto Rico) needed to be ship from our location in Miami Florida.

Most of International orders cannot drop ship from supplier's warehouses(Except on some specific Brands)

Parts typically arrive at our warehouse within 2-7 business days.

Once parts arrive, we will email you a tracking number.

The business days you see at checkout are how long it takes for your package to arrive after we ship it

• Track my order

PAYMENT METHODS

We accept  Visa, Mastercard, AMEX, ApplePay,GooglePay, and Discover credit cards  and Paypal , as well as debit cards with a Visa or Mastercard logo.

Contact us at sales@bills-exhausts.com if you have any questions.

 *Products shipped within the state of Indiana are subject to a 7% sales tax.