Big Block Chevy Aluminum Cylinder Heads - Assembled

300cc Intake Port, 115cc Chamber, Oval Port 

   

 Foe sale is a new pair (2) of big block Chevy ProComp aluminum cylinder heads. These heads are assembled with springs, valves, retainers, and locks installed. Comes with features normally found in heads costing much more, including: 

• Hardened exhaust seats for unleaded fuel compatibility
• Bronze valve guides
• Manufactured with aircraft quality high grade aluminum alloy
• Multi-angle seat design for improved flow at low lifts
• Advanced port design for improved flow at all lifts
• Advanced combustion chamber design allows superb flame travel and burn
• Additional pushrod clearance machined along outside port walls
• Threaded accessory holes in ends of heads
• Retains stock intake/exhaust bolt locations
• Thick deck to resist warping and allow for additional milling if desired 

 

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PC3021-396C Specs Intake Port Volume 300cc (oval) Combustion Chamber 115cc Intake Valve Size 2.250" Exhaust Valve Size 1.880" Valve Stem Dia. 3/8" Intake Port Size 1.8" W x 1.95" T Exhaust Port Size 1.9" W x 1.65" T Spring Pocket Dia. 1.730" Exhaust Crossover No Plug Angle Weight (per head - bare) 28 lbs.
	Assemblies Include: Valve Material stainless steel Valve Type 1 piece, swirl polished Valve Length +.250" intake, +.100" exhaust Valve Spring Dia. 1.525", single Spring Pressure (closed)  140lbs @ 1.900" Spring Pressure (open)  380lbs @ 1.200" Coil Bind 1.160" Recommend Lift .600"-.650" (flat tappet cams) Retainers 4140 Chromoly steel Valve Locks 10 degree, hardened steel

 

 These heads are a great choice and at a great price, you will not find this kind of quality for the price we have them listed at. Perfect for everything from street, marine, and in any other performance/race application where a quality head at an affordable price is desired. A great upgrade from OEM factory heads. These heads are a better alternative compared to the rectangle port version if you aren't runnning a big stroker engine or all out race application, you'll get much better low end performance. They should handle up to about 600HP in as-is form without much problem. Further gains can be had with gasket matching and porting techniques.

 Aluminum material allows the benefit of higher compression ratios on the street compared to iron heads, not to mention how much weight they save compared to the factory cast iron ones! These ProComp big block heads have been tried and tested for a few years now with excellent results.

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We also carry these as a non assembled bare pair. Check out our ebay store for more cool products including other head selections including the rectangle port version!

  

See Our Ebay Store For More Related Items:

Head Studs

Stud Girdles

Gaskets

Valve Springs

Rocker Arms

More Valvetrain

More Heads

 

KMJ PERFORMANCE TECH AND EBAY PAYMENT LINE 1-515-233-3288

We are happy to combine shipping on Ebay auctions whenever possible. Normally it will be the highest shipping amount plus half the shipping amount on other items, sometimes better on orders of small items. There are some exceptions:

• Some items are not combined due to size or weight, for example: crankshafts, headers, intakes, torque converters, radiators, cylinder heads, steering shafts.
• If purchasing multiples of the same item please see auction shipping details for the additional amount.

On seperate multiple item purchases the shipping amount is not figured automatically during checkout so please request a new invoice or wait for us to send a combined invoice so we can adjust the total for you. In short, whenever we can help with shipping we will!

Payment:   

We accept Paypal and U.S. based credit cards (Visa/MC/Discover). Please make payment within 7 days of auction end. You can call us at (515)233-3288 for credit card payments or questions. 

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Shipping:

We do not ship to PO Boxes 

• Within the lower 48 states:
  The listed fixed price shipping is to the lower 48 states only. All others will be additional.

We are happy to combine shipping on Ebay auctions when possible. Normally it will be the highest shipping amount plus half the shipping amount on other items, sometimes better on orders of small items. Some items are not combined due to size or weight such as crankshafts, torque converters, radiators, cylinder heads, etc. On multiple item purchases the shipping amount is not figured automatically during checkout so please request a new invoice or wait for us to send a combined invoice so we can adjust the total.

We do have  auctions that state free shipping when purchased with certain items such as grommet kits with valve covers, pickup tubes with oil pans, etc. If purchasing items with free shipping, please request a new invoice before paying. The shipping amount is not figured automatically during checkout. We are unable to refund your Paypal once payment has been sent. If you have any doubt what your shipping will be please feel free to call us at 515-233-3288 during business hours.

• Outside the lower 48 and International:
  We use USPS Priority when possible (please see above note) which has the best combination of price, delivery time, and reliability. We strongly encourage you to please email for a s/h quote before bidding to areas outside the lower 48 states. Paypal payments $250 and above will ship only by UPS Express and require a signature on delivery.

Shipping based on weight and number of packages. We do try to combine as many items into one box as we can.  

Shipping amount is not figured automatically during checkout. Please request updated invoice after bidding. Some countries have size limit requirements that affect certain large items such as radiators and can not be shipped normal USPS Priority.

All items will be declared as actual value, we do not mark as "gift" or at a reduced value! Shipping costs are not figured into the actual value.

• Canada orders:
  UPS now has a special discounted program for shipping to Canada with us, please call or email to find out more!

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