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Heating and Cooling› Radiators

RCM

Engine Coolant Radiator

$107.25 $95.00 Save $12.25

SKU: RCM3303

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Roger Clark Motorsport RCM3303 is a Cylinder 4 Cooling Mod Kit designed for the EJ family of Subaru engines. This kit addresses the known issue of insufficient cooling around cylinder 4, which can lead to increased temperatures. The kit includes billet fittings and a custom 90-degree Samco silicon hose, designed to be easily fitted into an unused port at the back of the block at cylinder 4's location. It then tees into the water matrix pipe above using supplied HiGrip stainless steel fittings.
Show original supplier description
The Roger Clark Motorsport RCM3303 Cylinder 4 Cooling Mod Kit is engineered to solve a common issue on EJ family Subaru engines: the lack of adequate cooling around cylinder 4. This deficit can cause temperatures in this specific cylinder to rise. RCM offers a straightforward solution with this easy-to-install kit. It features billet fittings secured to a custom 90-degree Samco silicon hose. Installation involves fitting the hose into the unused port at the rear of the block near cylinder 4 and teeing it into the water matrix pipe directly above, utilizing the provided HiGrip stainless steel fittings. The billet barb fitting is precisely sized to ensure proper coolant flow for cylinder 4, offering cooling without causing overcooling. This kit is available in various colors, including Gloss Black, Blue, Red, Matte Black, and Classic Black.

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

BrandRCM
Part NumberRCM3303
CategoryHeating and Cooling

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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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