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Item: 204523469541
eBay Product Information Overview Item Condition: Brand New Specs Brand: Speedmaster Part Number: PCE281.2023 Part Type: Cylinder Heads Cylinder Head Style: Assembled Cylinder Head Material: Aluminum Cylinder Head Finish: Natural Combustion Chamber Volume (cc): 68 cc CNC-Machined Combustion Chamber: Yes Intake Runner Volume (cc): 217 cc Exhaust Runner Volume (cc): n/a CNC-Machined Intake Runner: Yes CNC-Machined Exhaust Runner: Yes Intake Port Shape: Square Intake Port Location: Standard Exhaust Port Shape: Square Exhaust Port Location: Standard Spark Plug Style: Straight Comp. Valve Job: No Intake Valves Included: Yes Intake Valve Diameter (in): 2.020 in. Exhaust Valves Included: Yes Exhaust Valve Diameter (in): 1.600 in.Ê Valve Springs Included: Yes Maximum Valve Lift (in): 0.580 in. Outside Diameter of Outer Spring (in): 1.450 in. Damper Spring Included: Yes Number of Springs Per Valve: Dual Retainers Included: Yes Retainer Material: Chromoly steel Locks Included: Yes Lock Style: 10 degree Valve Stem Seals Included: Yes Valve Stem Seal Style: Positive stop Rocker Arm Studs Included: NoÊ Rocker Arms Included: NoÊ Rocker Arm Nuts Included: NoÊ Guideplates Included: NoÊ Valve Cover Mounting Style: Center & Perimeter Bolt Accessory Bolt Holes Drilled: YesÊ Intake Valve Angle: 23 deg. Exhaust Valve Angle: 23 deg. Valve Guides Included: YesÊ Valve Guide Material: BronzeÊ Valve Seats Machined: Yes Valve Seat Machine Style: 3-angle Valve Seat Material: Ductile ironÊ Steam Holes Drilled: No Oiling Style: Through pushrodÊ Machined for O-Ring: NoÊ Heat Crossover: No Quantity: Sold as a pair. Calculator Compression Calculator Attachments Speedmaster Description Assembly Specifications Max Lift: .580″ Coil Bind: .750″ Intake Install: 145lbs @ 1.9 Exhaust Install: 145lbs @ 1.9 Closed Sear Pressure: 145lbs Open Seat Pressure: 360lbs All Speedmaster 23deg. Small Block Chevy heads are available with Straight or Angled sparkplugs. Standard valve sizes are 2.020″ Intake, and 1.60″ Exhaust, both +.100″ length. While the 2.02″ valves are standard issue, all of our 23deg. aluminum heads can accept a 2.05″ intake valve with minimal additional work. Some of our CNC ported heads (PCE281.1354-1448) are designed around 2.05″ Intake valves. Our cast iron heads use 1.94″ intake valves, and 1.50″ exhaust valves. For those racers looking for a head with 800+hp potential, step up to our new 15deg heads! These heads have room for huge 2.180″-2.200″ intake valves. We even have the matching rockers! Speedmaster CNC ported cylinder heads are machined on dedicated 4-axis and 5-axis CNC machining centers to ensure accuracy and cost effectiveness. Combustion Chamber, Exhaust and Intake Ports all fully CNC machined for better flow. CNC combustion chambers offer superior control over flame travel and quench area. CNC Ported heads eliminate human error and variation from port to port. Unsurpassed repeatability from one cylinder head to another that is commonly found in “Hand porting & Polishing” Combustion chambers are exact in volume – so every cylinder has the same compression ratio. Each port is the same cross section – so every cylinder can reach higher true RPM potential. CNC machining produces ports and chambers to within tolerances of no more than .002″; in turn every cylinder can reach the same power potential and accurate tuning. Head Gaskets The head gasket we recommend for our 23deg. heads used on 327/350/383/400 SBC engines without steam holes is Felpro #1003. On engines using the GM 400 block, or aftermarket blocks with steam holes, use Speedmaster PCE348.1006 or Felpro #1014. Intake Gaskets Our heads are manufactured with both the conventional intake manifold bolt pattern, and the Vortec bolt pattern. If you’re installing a Vortec manifold, use Felpro #1255 gaskets. If you are using a convential intake manifold, use Speedmaster PCE349.1002 or Felpro #1266 gaskets. Push Rods Our aluminum 23deg. heads typically use +.100″ (longer than stock) pushrods, Depending on the components used, it is possible that you may need pushrods shorter or longer than that so we recommend that you use an adjustable pushrod to dial in your rocker geometry and order pushrods to match. Spark Plugs All Speedmaster 23deg. SBC heads use standard 14mm. x 750″ reach, 5/8 hex, gasket seat sparkplugs like NGK R5671A-7, Autolite 3924, Champion RC12YC, etc. Remember that higher compression/ boost require a colder heat range sparkplug. Head Bolts / Studs Our 23 degree heads utilize standard head bolts or studs. Our part number for head bolts is PCE279.1002, and the head studs are PCE279.1001. For the 15 degree heads, we recommend SM2451-15DEG. headstud kit with 3/8″ reduced shank on the studs between intake ports. The ARP head bolt part number is 134-3601, and ARP head studs 234-4301 for the 23 degree heads. ARP also makes a head stud kit that is compatible with our 15deg. heads on cast iron blocks with part number 234-4723. Exhaust Gaskets We recomend the use of our Exhaust gaskets # SM5120 or Fel-Pro #1405 on our 23 degree heads. On our 15 degree heads, use SM5121 or Fel-Pro #1409. Brand Information In 1979, the company was founded with Pete’s Performance, which was a small speed workshop. It began by building engines for customers as a hobby, and it has now grown to include selling, assembling, manufacturing and racing high performance engine parts. Over the years, the company has grown into a worldwide high performance powerhouse. Growing from a one-man bricks-and-mortar business; to now a supply chain in which entails more than 400+ people all across the world. Today, Pete’s Performance has evolved into the internationally known Speedmaster: which has distribution centres and offices is Sydney, Los Angeles and Shanghai. Prop 65 Warning WARNING: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to https://www.p65warnings.ca.gov/ LOYALTY PROGRAM® UNLOCK / SAVE / ENJOY Earn points to climb tiers and enjoy benefits such as access to special offers and discounts, advance notice of events and promotions and more. Everyone starts with Red Status and can rise through Bronze, Silver, Gold, Platinum, Black and Vibranium. As you ascend, you become entitled to more valuable privileges. To see how your points are tracking, just login to Your Account. Terms & Conditions Policy A RETURN AUTHORIZATION is required prior to sending back any items. Items without Return Authorization will not be accepted and returned at your expense. Our parts are aftermarket performance components designed to be used in our recommended applications, installing in non-recommended applications will void any warranty. Actual product may vary from the picture(s) provided. All returns are subject to a Restocking Fee of up to 20%. Only new, unused, 100% saleable condition Products are eligible to be returned. California Residents are subject to Sales Tax. Unless otherwise specified in our description, our parts are not approved for CARB applications or other smog certifications. Please check the regulations in your state before purchasing performance and aftermarket components. International Buyers Please Note: Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up (Please do not confuse them for additional shipping charges). We cannot mark merchandise values below value or mark items as ‘gifts’ – US and International government regulations prohibit such behavior. We are not responsible for the time your county’s customs office holds the items. For any international sale buyer is responsible for all shipping charges including return shipping. Please Review our Terms & Conditions before bidding If you bid on any of our auctions, you are agreeing to our terms and conditions. The successful high bidder must complete the sale transaction within 5 working days from the date of receipt email notification following the end of sale. All item are Subject to CA tax. We will contact the winning bidders via e-mail within 24 hours after the auction has ended. All pictures displayed in our auctions are for illustration purposes only. All descriptions are provided in the best of our knowledge. While all care is taken, any errors or omissions in the item details is unintentional. We reserve the right to cancel/end the auction earlier. Shipping & Delivery All our auctions have a postage calculator, so please enter your postcode to calculate your shipping costs. Dispatch of goods is during business hours from Monday – Friday. Item will not ship until payment has been received in full. Once payment is received in full you will be notified by email with tracking number as well as the tracking number will be uploaded to your purchase history. Please check tracking number for shipment status and updates. We are not responsible for shipping company delays out of our control such as adverse weather conditions or seasonal delays. In the event of any delays within the tracking history please contact the respective shipping company. We will do everything in our control to get your package to you right and fast, but ultimately we cannot be held responsible for lost, stolen or damaged packages. Warranty Warranty is 12 months unless stated otherwise in the Ad description. Problems If you have a problem with a product or our service, please contact us prior to filing a dispute or posting unfavorable feedback so we may quickly try to get the issue resolved to your satisfaction. If you as a buyer do not fully agree with all of the terms and conditions detailed above please do not go through with your purchase. By purchasing this product you are agreeing to the terms and conditions contained herein. Thank you very much for interest, we appreciate your business. Product Fitment Announcement This product application notice is regarding the eBay fitment categories allocated to this listing. Seeing as we sell aftermarket parts; this listing fitment application categories cover both standard replacement and ‘common upgrade’ options for specific vehicle applications (eBay fitment categories). Therefore, please read the description carefully and understand your application before purchasing this item; as it may not suit your application. Please note: high performance parts are not direct replacement parts for OEM parts, and may not fit your application as original OEM parts, and may require slight modifications depending on the intended purpose of some applications.
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