IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)
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IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)

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IAG-ENG-1051
$4,199.99

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IAG Stage 1 FA20 Subaru Short Block for 2013-18 BRZ / 2013-16 FR-S (10.0:1 Compression Ratio)

IAG Stage 1 FA20 Short Block


The IAG Stage 1 short block starts with new Subaru FA 2.0L BRZ engine case halves that are machined for improved oiling. Then the case is bored and honed to 86.1mm on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. IAG's in-house honing process is able to set piston to wall clearances tighter for a quieter running engine. The short block is measured and assembled using a new FA20 WRX / BRZ Subaru crankshaft that is matched to King main bearings. IAG-Spec H-Beam rods with ARP2000 rod bolts are utilized along with King or ACL rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, lower compression IAG-Spec 86.1mm 10.5:1 compression ratio forged pistons are spec'd and installed finishing off the short block. The lower compression ratio is good for BRZ / FR-S forced induction conversion applications.

Stage 1 FA20 Includes:

  • Case Halves -Brand new OEM Subaru BRZ FA20 case halves
  • Case Machining - Modified for improved oiling
  • Case Machining - Bored and honed to 86.1mm
  • Pistons -IAG-Spec 86.1mm 10.5:1 Forged Pistons, Ring Set, and .150" x 2.250" Chromoly Wrist Pins
  • Connecting Rods -IAG-Spec H-Beam / ARP2000 Rod Bolts
  • Rod Bearings - ACL or King XPG
  • Main Bearings -King XPG
  • Crankshaft -New Subaru FA20 WRX / BRZ crankshaft
  • Case / Main Bolts -Standard Subaru case bolts
  • Hardware - OEM Oil Plug - comes preinstalled at the oil pan location

    Additional Options Available:
    • Oil Plugs & Rear Main Seal - Part # IAG-ENG-1722 [Add $34.99]
    Compression Ratio: 
    • 10.0:1 (2.5 lower than stock compression) on standard gasket thickness.

    Power: The IAG Stage 1 Short Block has a power output rating of 550BHP. 

    *All IAG Short Blocks are balanced and blueprinted. This short block features a lower compression and is intended for forced induction applications.

    *Pictures used for marketing purposed only, actual product may vary
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    Returns Policy

    Returns may be accepted within 14 days of purchase pending Return Merchandise Authorization (RMA). No returns or cancellations on special order items. All returns will be charged a 20% restocking fee, no exceptions.

    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. Item must be able to be resold as new. Several types of goods are exempt from being returned. Hazardous materials, fluids, greases, chemicals, and clothing are not able to return.

    Free shipping is available within the lower 48 states for most orders totaling $199 or more. A free shipping option will be available during checkout. This offer is for delivery address in the continental United States and excludes shipments going to Alaska, Hawaii, Military Boxes, and items that require freight shipping.

    Processing Time
    Patterson Performance stocks a large quantity of items at any given time. Some items may require drop shipping from one of our various distributors. In stock items will ship within 1-2 business days. If you're needing your product quickly, please contact us to verify product availability before placing your order. Orders requiring additional verification (security concerns, incorrect information, etc.) may need additional processing time. Estimated shipping dates are not guaranteed and are subject to change based on inventory levels and manufacturer lead times. Backordered items are shipped immediately once available.

    Items ship daily, If the item you ordered is not in stock, a member of our team will contact you via email / phone.

    Patterson Performance will only ship to an address that varies from your billing address if payment is made via Paypal or a financing partner.

    Patterson Performance ships from multiple warehouses throughout the United States, and sometimes from manufacturers overseas.

    You can simply contact us via email / telephone for a live inventory check

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