Cylinder Head Gasket – Fits Johnson/Evinrude V8 250-300HP (Replaces 340116, 333554)
Cylinder Head Gasket – Fits Johnson/Evinrude V8 250-300HP (Replaces 340116, 333554) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Johnson/Evinrude V8 250-300HP (Replaces...
Product Details
This replacement Cylinder Head Gasket – Fits Johnson/Evinrude V8 250-300HP (Replaces 340116, 333554) is engineered for Johnson/Evinrude 250-300HP V8 4-Stroke outboard engines from 1988 to 1998. It is also compatible with OMC Sea Drive 4.0L models manufactured between 1989 and 1990.
This part provides a direct interchange for Johnson/Evinrude 340116, 333554, GLM 35970, and Bombardier REC340116.
- Designed for a direct OEM-equivalent fit.
- Constructed from durable composite material to ensure a reliable seal.
- Specifically for V8 Loopcharged engines with a 3.6875" piston diameter.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 340116 |
| Johnson/Evinrude | 333554 |
| Bombardier | REC340116 |
| GLM | 35970 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits select V8 models under the Johnson/Evinrude and OMC brands.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | V8 | 250 | 4-Stroke | 1991–1998 | 340116 | |
| Johnson/Evinrude | V8 | 275 | 4-Stroke | 1988 | 340116 | |
| Johnson/Evinrude | V8 | 300 | 4-Stroke | 1988–1995 | 340116 | |
| OMC | Sea Drive 4.0L | - | 4-Stroke | 1989–1990 | 340116 | |
| OMC | Sea Drive 4.0L-CR | - | 4-Stroke | 1989–1990 | 340116 |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Direct OEM replacement
- Housing Material
- Composite material
- Dimensions
- Length: 55.0 cm, Width: 15.5 cm, Height: 0.3 cm
- Weight
- 0.14 kg (0.31 lbs)
- Fitting Type
- Compression gasket
- Other Technical Attributes
- For V8 Loopcharged engines with 3.6875" piston diameter
- Warranty
- Manufacturer's standard warranty
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 340116/333554)
Installation Notes
- Disconnect the battery and allow the engine to cool completely.
- Drain the engine coolant and disconnect all necessary hoses, wires, and components from the cylinder head.
- Carefully remove the cylinder head bolts in the sequence specified by the manufacturer's service manual.
- Remove the old head gasket and thoroughly clean both the engine block and cylinder head mating surfaces. Ensure they are completely free of old gasket material, oil, and debris.
- Position the new gasket correctly on the engine block; do not use sealant unless explicitly required.
- Carefully place the cylinder head onto the new gasket.
- Install and tighten the head bolts in the correct sequence and to the proper torque specifications using a calibrated torque wrench.
- Reconnect all components and refill the cooling system.
- Start the engine and carefully check for any coolant, oil, or compression leaks.
Troubleshooting & FAQ
How do I confirm this gasket is correct for my engine?
Verify your engine's model, horsepower, and year against the compatibility table. Cross-reference the OEM part number (340116 or 333554) with your existing part or service manual. Also, confirm your engine is a V8 with a 3.6875" piston diameter.
What are the common signs of a blown head gasket?
Symptoms include engine overheating, milky-white residue in the engine oil, coolant loss with no visible external leaks, white smoke from the exhaust, and bubbling in the radiator or coolant reservoir. A compression test can help confirm the diagnosis.
Is this a single gasket or a set for both cylinder heads?
This package contains a single (1) cylinder head gasket. For V-block engines like the V8, you will need to purchase two gaskets to service both cylinder heads.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. All our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.
What are the shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most regions, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is highly recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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