What is the bore size of a Ford 360?
The bore size of the Ford 360 V8 is 4.00 inches (101.6 mm), paired with a 3.58-inch (90.9 mm) stroke to produce 360 cubic inches of displacement in its common production form. Some variants or aftermarket builds may differ slightly.
The Ford 360 is a long-running V8 displacement used in a variety of trucks and cars from the late 1960s through the 1990s. Because Ford produced multiple blocks and revisions over the years, exact bore dimensions can vary by model year and market. This article outlines the typical bore specification and related dimensions, and notes where variations may occur for identification or rebuilding purposes.
Common bore and stroke specifications
The following details represent the standard configuration most owners and rebuilders will encounter for a Ford 360. They serve as a baseline for parts selection and measurements.
- Bore: 4.000 inches (101.6 mm)
- Stroke: 3.58 inches (90.9 mm)
- Displacement: 360 cubic inches (5.9 L)
- Block family: Ford M/M-block variants were used in many 360s
These figures describe the typical stock specification that yields the 360-ci displacement in common production engines. Because dimensions can vary with specific blocks, always verify your engine's exact bore and stroke before purchasing parts or performing a rebuild.
Variations you might encounter
While 4.000 inches and 3.58 inches are the standard benchmarks, some Ford 360 engines—especially those rebuilt, bored, or produced for special applications—may exhibit slight deviations. Confirming the exact measurements via the block casting number and calibration stamps is essential when ordering pistons, rings, and sleeves.
- Some blocks may have an oversize bore after machine work, such as around 4.030 inches, due to reboring or specific production runs.
- Aftermarket or performance builds may alter stroke, which changes displacement and requires compatible cranks, rods, and pistons.
- Gasket and sleeve choices depend on the exact bore to ensure proper sealing and clearance.
In practice, the vast majority of stock Ford 360 engines use a 4.000-inch bore. If you are restoring or modifying, verify the bore with your engine’s casting numbers to ensure compatibility with your parts kit.
Related considerations for builders
Beyond bore size, other critical dimensions—such as deck height, compression ratio, head design, and gasket thickness—affect performance and longevity. When planning a rebuild or upgrade, consult the appropriate factory manuals or a trusted engine shop to align all specifications.
What this means for enthusiasts and restorers
For hobbyists, starting with a 4.000-inch bore is a sensible baseline for the Ford 360, but always confirm the exact dimensions on your specific block before ordering parts. Accurate bore measurements prevent issues with piston-to-wall clearance, ring gaps, and head gasket fitment.
Summary: The Ford 360’s most common bore is 4.00 inches, paired with a 3.58-inch stroke to achieve 360 cubic inches of displacement. Variations exist across different blocks and aftermarket builds, so verifying bore and stroke on your specific engine is essential before purchasing parts or planning a rebuild.
Summary
The standard bore for a Ford 360 V8 is 4.00 inches, with a typical stroke of 3.58 inches, yielding 360 cubic inches. Always verify your engine’s exact dimensions from casting numbers and stamping to account for any variations across years or custom builds.
