IAG 800 FA20 DIT Closed Deck Long Block Engine w/ IAG 800 Heads

IAG 800 FA20 DIT Closed Deck Long Block Engine for 2015-21 Subaru WRX

DROP IN AND DRIVE

The IAG Performance hand-built 800 FA20F (DIT) Closed Deck Long Block is a complete, timed, valve cover-to-valve cover crate engine designed for Subaru WRX models from 2015–2021. This long block package offers significant ease of installation with a complete long block assembly that includes race-proven short block and cylinder head components. When paired with our Long Block Installation Packages, you have a true plug-and-play solution to get you back on the road fast. All components included are BRAND NEW and there is NEVER a core charge required. :contentReference[oaicite:0]{index=0}

SOLD COMPLETE, TIMED & READY TO INSTALL

Every IAG 800 FA20 Long Block is sold complete with all new timing components pre-installed, making installation more straightforward and minimizing the risk of timing-related errors. The timing system on Subaru FA20 engines is complex, so having a pre-timed long block helps ensure proper assembly and faster installation. :contentReference[oaicite:1]{index=1}

BUILT WITH 100% NEW COMPONENTS

The IAG 800 Long Block is engineered to support up to 800 BHP applications. The FA20F short block starts with new Subaru FA20 case halves machined for improved oiling and closed-deck strength using IAG Closed Deck Inserts. These inserts allow coolant flow at the deck surface and provide added rigidity. The short block is deck-plate bored and honed to 86.1mm using precision in-house equipment, then assembled with a new Subaru FA20 WRX crankshaft, ACL or King main bearings, and IAG-spec H-Beam connecting rods with ARP2000 rod bolts. IAG-spec forged 86.1mm pistons complete the assembly. :contentReference[oaicite:2]{index=2}

FORGED RODS & PISTONS

To address the known weaknesses in the OEM FA20 connecting rods at higher torque levels, the IAG 800 long block features reinforced IAG-spec H-Beam rods with ARP hardware and high-strength IAG-spec forged pistons. These upgrades provide the strength needed to handle increased cylinder pressures and boost levels. :contentReference[oaicite:3]{index=3}

CLOSED DECK FOR EXTRA STRENGTH

The unique IAG closed deck system significantly increases block rigidity by supporting the cylinder walls at the top of the case, preventing flex and potential cracking in high-pressure scenarios. The case halves are machined to accept the inserts, press fitted with liquid nitrogen and heat, and finished to a precise surface while maintaining coolant flow. This design minimizes the risk of overheating even under demanding conditions. :contentReference[oaicite:4]{index=4}

IAG 800 FA20 DIT CNC POCKET PORTED CYLINDER HEAD PACKAGE

Each IAG 800 FA20 DIT Cylinder Head Set starts with new OEM castings from Subaru, which are CNC machined on a Centroid 5-axis machine to perform precision pocket porting for optimized airflow. The heads are also drilled for ½" or 14mm head studs for increased clamping strength, then finished with GSC manganese-bronze guides, Kelford dual cylindrical valve springs, GSC Viton valve stem seals, and Kelford "A" 272 camshafts. OEM cam towers, rockers, pivots, and valve shim caps are included for a complete head assembly. :contentReference[oaicite:5]{index=5}

IAG 800 FA20 DIT LONG BLOCK INCLUDES

IAG 800 FA20 2.0L Short Block Includes:

• Brand new OEM Subaru FA20 case halves, bored & honed to 86.1mm
• Case machining modified for improved oiling
• Closed deck with O-ring receiver grooves
• Deck plate bored & honed
• Head studs machined for ½" studs (studs sold separately)
• IAG-Spec 86.1mm forged pistons, ring set, and wrist pins
• Connecting rods – IAG-Spec H-Beam with ARP2000 rod bolts
• ACL or King rod & main bearings
• Crankshaft – new Subaru FA20 DIT WRX crankshaft
• Case/main bolts – Standard Subaru case bolts
• OEM oil plug pre-installed at oil pan location

Compression Ratio:

• 10.5:1 compression on standard gasket thickness

IAG 800 FA20 DIT CNC Pocket Ported Cylinder Heads Package Includes:

• Brand new Subaru AW20 FA20 WRX DIT cylinder head castings
• GSC +1mm intake valves
• GSC +1mm exhaust valves
• Kelford dual cylindrical valve springs & retainers
• GSC manganese-bronze valve guides
• GSC valve stem seals
• IAG CNC pocket porting
• Multi-angle valve job
• Drilled for ½" or 14mm head studs
• Threaded coolant plug upgrade
• Resurfaced & ultrasonically cleaned
• Kelford "A" 272 camshafts
• OEM cam towers & hardware
• OEM rockers, pivots & lifters
• Valve lash caps & service

Gaskets, Hardware & Accessories:

• ARP 2000 ½" head stud set
• OEM head gaskets
• OEM valve cover gaskets
• OEM cam seals
• OEM valve covers
• OEM timing components & oil pump/timing cover
• Rear main seal & separator kit
• Crankshaft woodruff key

Please Note: This item is not eligible for standard ground shipping and must be delivered via freight. 
STOCK NOTICE: This item is built to order and carries a minimum 6-8 week build time.

IMPORTANT DELIVERY NOTE: Your order is shipping Via Truck Freight which requires you to be available at the time of receipt. There is a possibility the trucking company will try to schedule a delivery time with you. At the time of delivery, the driver will hand you the delivery receipt also referred to as the bill of lading, you will use this to notate any damages to the shipment. It is important that you fully inspect the shipment from all sides and notate any dents, punctures or rips in the outside packaging on the delivery receipt. Once you've inspected your shipment from the outside, you will need to open it and check the product in its entirety for damages and notate them if any. If there is no damage sign for the package and enjoy! In the rare case, you do find that your order arrived with damages, it is important you follow these steps. - Do not refuse the product- Document the damages in as much detail as possible on the Bill of Lading
- Take numerous photos from all angles (including packaging)
- Keep the product and contact the shipping company to start the damage claim
- Contact us either by phone or email for the next steps In the situation where the delivery driver is unable to wait for you to open and inspect your product, simply document "driver was unable to wait for inspection." All damage must be noted on the Bill of Lading before signing and initiating a damage claim. If the damage is not notated before signing for the item it is assumed to be in good condition. This will forfeit the ability for a shipping claim and you will not be eligible for refund or replacement.