Engines and Components› Pistons and Piston Rings

JE Pistons

FORD FLATHEAD 3.312/1.311

$623.68

SKU: J001 371841

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

If you're looking to enhance your Ford Flathead engine's performance, the JE Pistons Ford Flathead Piston Kit is your go-to solution. Designed specifically for the 371841 application, this kit includes a set of 8 high-quality pistons that are perfect for both street and racing conditions. With over 75 years of expertise in the industry, JE Pistons has established itself as a leader in forged racing pistons. Each piston is engineered, forged, and machined right here in the USA, ensuring that you receive a product that combines durability with high performance. Whether you're hitting the dirt track or the drag strip, these pistons are proven champions in the winner's circle.

Key Features:
* Premium Material: Made from 2618 aluminum, these pistons boast high tensile strength, making them ideal for demanding performance applications.
* Optimized Design: Each piston is tailored for specific engine applications, ensuring optimal performance and durability.
* Proprietary Forged Side Relief (FSR): This innovative design minimizes friction and power loss, featuring a reduced skirt width and a shorter wrist pin for weight savings.
* Skirt Coating: Depending on your application, the skirt coating reduces friction and wear, while also lowering operating noise.
* Accumulator Groove: This feature helps manage combustion gases, reducing ring fluttering and improving ring seal for consistent power delivery.
* 100% Made in the USA: Quality craftsmanship you can trust.

Specifications:
* Piston Series: JE Pistons
* Cylinder Head: FLATHEAD
* Bore Diameter: 3.312 inch
* Piston Head Type: Dome
* Compression Height: 1.311 inch
* Piston Volume: 0.00 CC
* Piston Material: 4032
* Piston Quantity: 8
* Forging Type: Round
* Ring Set Included: Yes
* Top Compression Ring Thickness: 0.5950 inch
* Second Compression Ring Thickness: 0.5950 inch
* Oil Ring Thickness: 0.159 inch
* Wrist Pin Material: 5115 Low Carbon Steel, Case Hardened
* Wrist Pin Length: 2.500 inch
* Wrist Pin Wall Thickness: 0.140 inch
* Sold As: Set of 8
Show original supplier description
FORD FLATHEAD 3.312/1.311

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.

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Specifications

BrandJE Pistons
Part NumberJ001 371841
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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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