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Engines and Components› Cylinder Heads and Components

Tomei

EJ20 93.5mm Bore 1.0mm Thickness Multi-Layered Steel Head

$120.00 $105.00 Save $15.00

SKU: TA4070-SB01B

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Tomei TA4070-SB01B is a single head gasket designed for Subaru EJ20 engines. It features a 93.5mm bore and a 1.0mm thickness, constructed from multi-layered steel.

Its stainless steel construction provides excellent heat conductivity for even heat distribution and cooling, improving reliability and durability under severe stress loads.
Show original supplier description
The Tomei TA4070-SB01B is a multi-layered steel single head gasket engineered specifically for Subaru EJ20 Single AVCS engines. Featuring a 93.5mm bore and a 1.0mm thickness, this gasket is designed to meet the rigorous demands of high-performance applications. Tomei's racing heritage translates into products built with the knowledge of extreme engine strain. This contributes to improved engine reliability and a reduced risk of gasket failure, especially under the severe stress loads associated with high-power applications. The design focuses on maintaining the highest precision for high-performance engines. It requires strict measurements and proper torque values on head studs and bolts to achieve maximum sealing. The gasket's thickness can also be adjusted to fine-tune the compression ratio, allowing for precise engine tuning to reach target settings. Fitment is confirmed for Subaru WRX STI models from 2013-2014. The manufacturer emphasizes that even miniscule measurement differences can lead to catastrophic engine failure, underscoring the importance of strict tolerances and proper installation. Tomei machines all engine components to enhance airflow and ensure proper sealing.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandTomei
Part NumberTA4070-SB01B
CategoryEngines and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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