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Air Flow Research BBC 300 CFM CNC Cylinder Heads (pr) O/P Assem. 3670

Air Flow Research BBC 300 CFM CNC Cylinder Heads (pr) O/P Assem. 3670

$3,749.92
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  • With some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to our more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.
  • Heads are designed for 3/8" pushrods. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
  • For ideal geometry and wipe pattern AFR strongly recommends AFR stud mount rockers part #6043 for applications below 7400 RPM and .790 lift. For applications above these limits shaft mount rockers are typically advised.

    • For over 50 Years

    Air Flow Research has been defining technological leadership in cylinder head manufacturing and flow dynamics. This complete commitment to performance has enabled Air Flow Research's cylinder heads to find themselves on the fastest race cars and the most powerful street machines in the country. As every engine builder will attest to, the secret to increasing horsepower and performance lies in the cylinder head. Air Flow Research's cylinder heads outflow and out horsepower everything in their league.


    Aluminum Cylinder Head & Manifold Warranty

    Effective on purchase made on or after January 1, 2010, AFR warranties AFR aluminum cylinder head castings for the lifetime of the product with proof of purchase to the original purchaser. Additionally, valves, guides, valve seats, valve springs, retainers, locks, studs, guide plates, and valve seals are warranted for two years to the original purchaser with proof of purchase. All returns must have a RMA number in order to be returned, call for a RMA number. Parts must be returned prepaid freight by the original purchaser. When it has been determined, by AFR at its sole discretion, that the product does indeed have a warrantable problem from workmanship, materials, or an undetermined cause (mystery failure) AFR will repair at no charge and reimburse UPS ground freight and return UPS ground freight. AFR will repair or replace the casting at its option. This warranty doesn’t cover fitness for purpose and/or merchantability on any product sold by AFR. Non-AFR castings are covered by the manufacturer of that casting. Please call us if you have questions about which manufacturer your head is made by.

    Composite Manifold Warranty:

    AFR warranties their composite intake manifold to be free of defects for a period of one year's time. All returns must have a RMA number in order to be returned, call for a RMA number. Parts must be returned prepaid freight by the original purchaser. When AFR determines at its sole discretion that the product does indeed have a warrantable problem from workmanship, material, or an undetermined cause AFR will repair or replace at no charge. This warranty does not cover fitness of purpose and/or merchantability on any products sold by AFR.

     

    This warranty does not cover the following:

    1. Failure due to improper installation or maintenance, abuse, misuse, unauthorized repairs, modifications, or alterations determined at the sole discretion of AFR. If your machine shop, engine builder or installer performs any unauthorized repairs, AFR warranty is voided and AFR will not reimburse any cost you incurred.
    2. Removal or replacement cost.
    3. Costs incurred due to down time of the vehicle.
    4. Damage to related components.
    5. Marine saltwater corrosion.
    6. Corrosion from not using/refreshing antifreeze.
    7. Fitness for purpose or merchantability.

    Our Guarantee

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      30 Day Guarantee- Refunds within 30 days of the original order date. Exclusions Apply.

    Spec Sheet

    • BrandAir Flow Research
    • SKUAFR3670
    • Brand

      Brand

      For over 50 Years

      Air Flow Research has been defining technological leadership in cylinder head manufacturing and flow dynamics. This complete commitment to performance has enabled Air Flow Research's cylinder heads to find themselves on the fastest race cars and the most powerful street machines in the country. As every engine builder will attest to, the secret to increasing horsepower and performance lies in the cylinder head. Air Flow Research's cylinder heads outflow and out horsepower everything in their league.

    • Fitment

      Fitment

    • Warranty

      Warranty


      Aluminum Cylinder Head & Manifold Warranty

      Effective on purchase made on or after January 1, 2010, AFR warranties AFR aluminum cylinder head castings for the lifetime of the product with proof of purchase to the original purchaser. Additionally, valves, guides, valve seats, valve springs, retainers, locks, studs, guide plates, and valve seals are warranted for two years to the original purchaser with proof of purchase. All returns must have a RMA number in order to be returned, call for a RMA number. Parts must be returned prepaid freight by the original purchaser. When it has been determined, by AFR at its sole discretion, that the product does indeed have a warrantable problem from workmanship, materials, or an undetermined cause (mystery failure) AFR will repair at no charge and reimburse UPS ground freight and return UPS ground freight. AFR will repair or replace the casting at its option. This warranty doesn’t cover fitness for purpose and/or merchantability on any product sold by AFR. Non-AFR castings are covered by the manufacturer of that casting. Please call us if you have questions about which manufacturer your head is made by.

      Composite Manifold Warranty:

      AFR warranties their composite intake manifold to be free of defects for a period of one year's time. All returns must have a RMA number in order to be returned, call for a RMA number. Parts must be returned prepaid freight by the original purchaser. When AFR determines at its sole discretion that the product does indeed have a warrantable problem from workmanship, material, or an undetermined cause AFR will repair or replace at no charge. This warranty does not cover fitness of purpose and/or merchantability on any products sold by AFR.

       

      This warranty does not cover the following:

      1. Failure due to improper installation or maintenance, abuse, misuse, unauthorized repairs, modifications, or alterations determined at the sole discretion of AFR. If your machine shop, engine builder or installer performs any unauthorized repairs, AFR warranty is voided and AFR will not reimburse any cost you incurred.
      2. Removal or replacement cost.
      3. Costs incurred due to down time of the vehicle.
      4. Damage to related components.
      5. Marine saltwater corrosion.
      6. Corrosion from not using/refreshing antifreeze.
      7. Fitness for purpose or merchantability.
    • Reviews

      Reviews

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