Edelbrock Cylinder Heads 38-48 Ford/Merc (Pair)

The Edelbrock #1125 Ford Flatheads feature the original Edelbrock script logo design for Fords and Mercurys, and are cast at the Edelbrock Foundry in the USA of T-6 tempered A356 aluminum. The Edelbrock #1125 heads are rugged, ribbed internally and externally, with a large water capacity and excellent breathing characteristics. The 65cc heads support 8.0:1 compression ratio on blocks with a 3/16" base relief (stock bore and stroke), compression ratio increase is approximately 3/10 of a percent with each 1/8" stroke.

Additional Information

The Edelbrock #1125 Ford Flatheads feature the original Edelbrock script logo design for Fords and Mercurys, the heads are rugged, ribbed internally and externally, with a large water capacity and excellent breathing characteristics.

Application Summary

Ford:Flathead:221 (3.6L)/239 (3.9L);Mercury:Flathead:221 (3.6L)/239 (3.9L)

Part Type

Engine Cylinder Head

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

• Increased Flow Capacity

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Product Details

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Cylinder Heads, Bare, Aluminum, Natural, Ford, Flathead V8, Pair

Edelbrock Ford flathead cylinder heads feature your choice of the original Edelbrock script logo or the block-style logo. Designed for both Fords and Mercurys, these heads are rugged, ribbed internally and externally, with a large water capacity, and excellent breathing characteristics. Available with 74 cc or 65 cc chamber volumes, the 65cc heads support an 8.0:1 compression ratio on blocks with a 3/16 in. base relief (stock bore and stroke); compression ratio increase is approximately 3/10 of a percent with each 1/8 in. of stroke increase.

The high lift/large chamber versions feature a new "raised roof" combustion chamber design and are CNC-machined for high lift cams. Perfect for reducing compression in supercharger applications or for low octane fuel, they offer increased valve clearance and improved flow capacity. Match these heads with Edelbrock's popular Ford flathead intake manifolds.

Edelbrock Ford flathead cylinder heads are cast at the Edelbrock foundry in the USA of T-6 tempered A356 aluminum. They're available for a wide range of vehicles from the 1930s, '40s, and '50s.