Engine Displacement Calculator: Bore and Stroke to CID, Liters, CC with Famous US Engine Lookup
Three engine math tools in one: calculate displacement from bore and stroke in any unit with overbore and stroker support plus a proportional SVG cylinder diagram, solve backwards for the bore or stroke needed to hit a target displacement, and convert between cubic inches, liters, and CC with an instant match against 35 famous US engines.
🛠 Select Calculation Mode
⚙ Engine Specs
Classic SBC: 4.000″. BBC 454: 4.250″. Cummins 6.7: 4.213″.
SBC 350: 3.480″. BBC 454: 4.000″. LS3: 3.622″.
🔧 Overbore / Stroker (Optional)
Enter in same units as above. .030 over = 0.030″.
Extra stroke from stroker crank. E.g. 0.250″ for a common SBC 350 to 383 stroker kit.
🎯 Target Displacement
Example: Target 383 CID, solve for stroke, known bore 4.030″ (a typical .030 overbore SBC). Stroke needed = 3.750″ (classic 383 stroker kit).
🔄 Engine Size Converter with Famous Engine Lookup
Enter 350 CID to see 5.73L / 5733cc. Enter 5.0 liters to see 305 CID / 5000cc. Includes nearest match from 35 famous US engines.
📊 Displacement Results
🛠
Enter bore and stroke to calculate CID, liters, CC, bore/stroke ratio analysis, and nearest famous US engine. Or solve for the bore or stroke needed to hit a target displacement. Or convert between cubic inches, liters, and CC.
How Engine Displacement Is Measured in the US: CID, Liters, and the Relationship Between Them
For most of automotive history in the United States, engine size was communicated in cubic inches of displacement — the total swept volume of all the pistons during one complete cycle. A 350 cubic inch engine, a 427, a 454: these numbers defined the performance hierarchy of American muscle cars through the 1960s and 1970s. The shift to liters as the primary designation happened gradually in the early 1980s as emissions regulations, fuel economy standards, and the growing influence of foreign-market engineering brought metric designations into common US automotive language.
Today both systems coexist. The Ford 7.3-liter Godzilla V8 is also 445 cubic inches. The Cummins 6.7-liter ISB diesel is 408 cubic inches. The Chevy 6.2-liter LS3 is 376 cubic inches. A modern engine enthusiast needs to move fluently between both systems — which is exactly what the CID/L/CC Converter mode does, including a lookup against 35 famous US engines to instantly tell you how close your displacement is to a recognizable benchmark.
The Bore, Stroke, and Cylinder Count Formula Behind Every CID Number
Displacement is calculated using the volume of a cylinder: Volume = (PI / 4) x bore_squared x stroke. Multiply by the number of cylinders and you have the total engine displacement. The bore (cylinder diameter) appears squared in the formula, which is why bore has a disproportionate effect on displacement compared to stroke — doubling the bore from 2 inches to 4 inches quadruples the displacement, while doubling the stroke from 2 to 4 inches only doubles it. This relationship explains why engine builders who want maximum displacement increases from overbore machining see diminishing returns compared to adding stroke through a longer crankshaft.
How the Three Engine Displacement Modes Work
Mode 1: Bore x Stroke to CID, Liters, and CC
Enter bore and stroke in either inches or millimeters, select your cylinder count, and optionally add overbore and overstroke amounts for a rebuilt or stroked engine. The calculator returns total displacement in all three units, displacement per cylinder, and a bore/stroke ratio analysis telling you whether the engine is oversquare (favors high-RPM horsepower), undersquare (favors low-RPM torque), or square (balanced). A proportional SVG cylinder diagram shows the bore versus stroke to scale. If the calculated displacement is close to a famous US engine, the calculator identifies it by name.
Mode 2: Solve for the Bore or Stroke Needed for a Target Displacement
Engine builders frequently work backwards from a target displacement. “I want 383 cubic inches out of this SBC block. I am boring it .030 over to 4.030 inches. What stroke crank do I need?” Enter 383 CID as the target, 4.030 inches as the known bore, and the calculator solves for the required stroke: 3.750 inches — exactly the stroke of the common 3.750-inch 383 stroker crank sold by companies like Eagle, SCAT, and Lunati for millions of small-block Chevy builds.
Mode 3: CID to Liters to CC with Famous US Engine Identification
The simplest mode: enter any engine size in any unit, get the other two units instantly, and see which of 35 famous US engines your displacement is closest to. A database including every major American V8 — from the Chevy 265 and 283 Small Block to the Ford 7.3 Godzilla, Chrysler 426 Hemi, Cummins 6.7, and Duramax 6.6 — with exact bore, stroke, and cylinder configuration for reference.
Three Real US Engine Builder Scenarios Calculated
Scenario 1: Building a 383 Small Block Chevy Stroker
The 383 Small Block Chevy is the most popular engine build in American hot rodding. The concept: take the standard 350 SBC block (4.000-inch bore), machine it .030 over (4.030-inch bore), and install a stroker crankshaft that increases stroke from the stock 3.480 inches to 3.750 inches. The result is a 383 cubic inch engine from a 350 block.
Parameter
Stock SBC 350
383 Stroker
Bore
4.000″
4.030″ (.030 over)
Stroke
3.480″
3.750″ (stroker crank)
Cylinders
8
8
Displacement
349.85 CID / 5.73L
382.65 CID / 6.27L
Displacement gain
+32.8 CID (+9.4%) — more stroke-driven torque
The 383 consistently produces more torque than a stock 350 at the same power level because the additional stroke increases the mechanical advantage (torque arm) of the piston pushing on the crankshaft. A mild street 383 with iron heads and a single-plane intake typically produces 400 to 430 lb-ft of torque compared to 380 to 410 lb-ft from an equivalently built 350. Use the Solve for Bore/Stroke mode to verify: enter 383 CID, 4.030-inch bore, 8 cylinders, solve for stroke — the calculator returns 3.748 inches, confirming the 3.750-inch stroker crank is the correct choice.
Scenario 2: Identifying a Mystery Engine from Bore and Stroke
A truck owner pulls a used engine from a salvage yard with no documentation. The engine is a V8. He measures the bore at 4.094 inches and the stroke at 3.760 inches using a dial bore gauge and crankshaft measurement tool.
Measurement
Value
Bore
4.094″
Stroke
3.760″
Cylinders
8
Calculated displacement
396.0 CID / 6.49L
Nearest famous engine match
Chevy 396 BBC (4.094″ bore, 3.760″ stroke) — exact match
The calculator’s famous engine lookup confirms this is a Chevy 396 Big Block engine. The 396 was produced from 1965 to 1969 and appeared in Chevelles, Camaros, Impalas, and full-size trucks. Its exact bore and stroke are unique in the database, making the match definitive. This scenario illustrates why the famous engine lookup is useful for identification: many US engines share similar displacements but differ in bore/stroke configuration, and matching both measurements to the database eliminates ambiguity.
Scenario 3: Converting a Modern LS Engine for Fender Badge or Paperwork
A Corvette owner with an LS3 engine needs to declare the engine displacement on a custom vehicle title in a state that asks for cubic inches rather than liters, and also wants to know the exact CC count for his engine swap documentation.
What He Knows
What He Needs
LS3 engine = 6.2 liters
Exact CID for title
State title form asks for CID
CC for swap documentation
LS3 bore = 4.065″, stroke = 3.622″
Confirmation of true displacement
Result
376 CID / 6.162L / 6,162 cc
Entering 6.2 liters in the converter returns 378.4 CID (which is what most people would write, but is rounded). The exact bore-and-stroke calculation for the LS3 (4.065-inch bore, 3.622-inch stroke, 8 cylinders) returns 376.0 CID and 6,162 cc — the correct values for official documentation. Note that “6.2 liter” is the marketing designation, and the actual calculated displacement (6.162 liters from true bore and stroke) is what the GM factory used for engineering documentation. Many engine swappers incorrectly write 6.2L = 378 CID on title paperwork; the correct figure is 376 CID from the actual bore and stroke calculation.
Three Things Every Engine Builder Gets Wrong About Displacement
Tip 1: Bore Has More Displacement Impact Than Stroke Per Unit of Change
Because bore appears squared in the displacement formula, small increases in bore diameter create larger displacement gains than equivalent stroke increases. For a standard SBC V8 (4.000 bore, 3.480 stroke): adding 0.030 inches to the bore (a common .030 overbore) adds 4.8 cubic inches. Adding the same 0.030 inches to the stroke adds only 1.5 cubic inches. This is why engine builders who want maximum displacement from a single bore size use stroker cranks for the bulk of the gain, while overboring primarily serves to true-up worn cylinders and provides a secondary displacement benefit.
The practical limit for overboring a cast-iron block is typically 0.060 inches over stock before cylinder wall thickness becomes a concern. For aluminum blocks, the limit varies by design. A .030 over SBC achieves 4.030-inch bore. A .060 over SBC reaches 4.060 inches. Both are within safe limits for a standard 350 block in good condition. Factory service manuals specify the maximum allowable overbore for each engine family; the Chevy small block specification is available from Chevrolet and documented extensively in the Corvette and Camaro engineering archives.
Tip 2: The Bore/Stroke Ratio Determines the Engine’s Personality as Much as Its Size
Two engines with identical displacement can perform completely differently based on their bore/stroke ratios. An oversquare engine (bore larger than stroke) like the original 302 Ford small block (4.000-inch bore, 3.000-inch stroke, 1.33:1 ratio) is designed for high-RPM breathing — the large bore allows big valves for high-flow cylinder heads, while the short stroke reduces piston speed at a given RPM, allowing the engine to rev safely to 7,000 to 8,000 RPM. An undersquare engine (stroke longer than bore) like the Cummins 6.7 ISB diesel (4.213-inch bore, 4.882-inch stroke, 0.86:1 ratio) develops enormous low-RPM torque from the long piston stroke and is optimized to pull heavy loads at low engine speeds.
The bore/stroke analysis in this calculator’s Mode 1 classifies your engine and explains what the ratio means for performance character. This analysis is particularly useful when planning an engine build — understanding whether your bore/stroke ratio supports your intended RPM range and power band helps in selecting appropriate cylinder heads, camshafts, and intake manifolds to complement the engine’s geometric personality.
Tip 3: Factory “Displacement” Names Often Round to Nearest Nominal Size
The displacement number on a fender badge or engine sticker is frequently a rounded marketing figure, not the exact calculated displacement. The legendary “350” Chevy small block actually displaces 349.85 cubic inches — close enough to 350 for marketing purposes. The Dodge “6.4 Hemi” displaces approximately 376 cubic inches, not the 392 cubic inches its historical name implies (392 refers to an older Chrysler HEMI from the 1950s). The Ford “7.3 Godzilla” displaces 444.9 cubic inches, close enough for badge-engineering purposes to call it 7.3 liters even though the calculated CID is nearer to 445 than 446.
This matters for registration and insurance paperwork. A vehicle registered with “5.7L” on its documentation is typically accepted to mean 348 to 352 cubic inches for insurance and legal purposes, but technical documentation (engine swap titles, race car tech cards, custom vehicle registrations) may ask for the mathematically calculated displacement rounded to the nearest whole cubic inch. Always use the bore and stroke calculation to determine the precise value for technical documentation, and use the marketing rounded figure only where approximate values are explicitly accepted.
16 Engine Displacement FAQs for US Builders and Enthusiasts
The formula is: CID = (PI / 4) x bore_squared x stroke x number_of_cylinders. All values must be in inches for the result to be in cubic inches. Broken down for a Chevy 350: bore = 4.000 inches, stroke = 3.480 inches, cylinders = 8. CID = 0.7854 x 16.000 x 3.480 x 8 = 349.85 cubic inches. The 0.7854 is PI divided by 4, which converts bore diameter to cross-sectional area. To get liters from CID: multiply by 0.016387. To get CC from CID: multiply by 16.3871.
Multiply cubic inches by 0.016387 to get liters. The conversion factor is 1 cubic inch = 16.3871 cc = 0.016387 liters. Common conversions: 302 CID x 0.016387 = 4.95 liters (advertised as “5.0L”). 350 CID x 0.016387 = 5.73 liters. 454 CID x 0.016387 = 7.44 liters. 396 CID x 0.016387 = 6.49 liters. The reverse — liters to CID — is: divide liters by 0.016387 or multiply by 61.02. So 6.2 liters / 0.016387 = 378.4 CID (note: the actual LS3 calculates to 376.0 CID from bore and stroke; the 6.2L designation is rounded).
The Chevy 350 SBC uses a 4.000-inch bore and 3.480-inch stroke for 349.85 cubic inches. The 383 stroker uses the same SBC block bored .030 over (4.030-inch bore) with a 3.750-inch stroke crankshaft from a 400 SBC, yielding 382.65 cubic inches. The 383 has approximately 9.4 percent more displacement, concentrated in a longer stroke that increases low-RPM torque. The 383 makes more power with the same cylinder head and camshaft specifications because there is more air-fuel mixture per cycle. The 383 is the most popular American engine build for street performance because it uses inexpensive SBC hardware with a widely available aftermarket stroker kit (Eagle, SCAT, Lunati all make complete rotating assemblies for $600 to $1,500).
Oversquare means the bore diameter is larger than the stroke length (bore/stroke ratio greater than 1:1). Examples: Ford 302 (4.000 bore, 3.000 stroke, 1.33:1 ratio), LS3 6.2L (4.065 bore, 3.622 stroke, 1.12:1 ratio). Oversquare engines favor high-RPM operation for two reasons. First, a larger bore allows larger valve diameters, increasing airflow capacity. Second, a shorter stroke reduces average piston velocity at a given RPM, allowing the engine to rev higher before piston and rod stress become limiting. Most high-performance American V8 engines are oversquare. The opposite — undersquare (stroke longer than bore) — favors low-RPM torque and is common in diesel engines like the Cummins 6.7 (4.213 bore, 4.882 stroke, 0.86:1 ratio).
For the Chevy Small Block (SBC) in cast-iron form, 0.030 inches over stock is the standard light rebuild bore and universally considered safe. 0.060 inches over is the maximum for most SBC blocks — larger than this risks cylinder wall breakthrough or excessive ring seal problems under boost. For the 4-bolt main two-bolt main SBC block, .040 over is often used as a conservative maximum for performance applications. Chevy Big Block (BBC) cast-iron blocks are more robust and typically can handle up to .080 over without concern. Aluminum performance blocks (like those from Dart, Brodix, or World Products) are often designed with thicker cylinder walls specifically to accommodate larger overbores. Always measure actual wall thickness before boring; the thickness varies by casting and needs to be verified by your machinist before specifying an overbore amount.
The Chevy 454 Big Block has a 4.250-inch bore and 4.000-inch stroke with 8 cylinders. Calculated displacement: (PI/4) x 4.250 x 4.250 x 4.000 x 8 = 453.96 cubic inches (rounded to 454). In liters: 454 x 0.016387 = 7.44 liters. The 454 was produced from 1970 to 1990 in passenger car applications and longer in truck applications, appearing in Chevelles, Corvettes, Camaros, Impalas, Blazers, pickups, and motor homes. The LS6 version of the 454 (1970 Chevelle SS) is widely considered one of the most powerful factory US V8 engines of the muscle car era, rated at 450 horsepower. Stock bore and stroke numbers for any engine can be entered in Mode 1 to verify exact displacement.
A 350 cubic inch engine is 5,733 cc. The conversion: 350 CID x 16.3871 cc/CID = 5,735.5 cc (rounded to 5,733 from exact bore and stroke calculation). In liters: 5,733 cc / 1000 = 5.733 liters (commonly rounded to 5.7L in marketing designations). This is why the Chevy 350 and the GM LS1 (346 CID, but often referred to as “5.7L”) appear similar but are not identical. The LS1 uses a different bore and stroke (3.898″ bore, 3.622″ stroke) for 346.0 CID and 5,670 cc, while the original Small Block 350 uses 4.000″ bore and 3.480″ stroke for 349.85 CID and 5,733 cc. Both are marketed as “5.7L” but differ by 83 cc in actual displacement.
Displacement per cylinder is the swept volume of a single cylinder, calculated as total displacement divided by the number of cylinders. For a Chevy 350 V8: 349.85 CID / 8 = 43.73 CID per cylinder (716 cc per cylinder). Per-cylinder displacement matters for combustion tuning: engines with larger per-cylinder volumes (more cc per hole) can support larger injectors, longer duration camshaft profiles, and higher cylinder head flow requirements at a given RPM. An 8-cylinder engine with 50 CID per cylinder behaves very differently from a 6-cylinder with the same 50 CID per cylinder even if the total displacement is the same, because the larger cylinders need different airflow management at a given engine RPM.
The Ford 5.0 Coyote V8 (2011-present) has a 3.630-inch bore and 3.650-inch stroke for 8 cylinders, yielding 301.98 cubic inches (approximately 302 CID) and 4,951 cc (4.95 liters). This is essentially a “modern 302” — the same cubic inch displacement as the classic Ford 302 small block, but with completely different bore and stroke dimensions. The Coyote’s nearly square bore/stroke ratio (0.994:1) gives it a different power band than the classic 302’s oversquare 1.33:1 ratio (4.000 bore, 3.000 stroke). The Coyote’s square design allows it to make power over a wider RPM range, which is why the Gen 3 version (2018+) produces 460 horsepower in the Mustang GT while the classic 302 in stock form rarely exceeded 230 horsepower.
Yes, the formula is identical: (PI/4) x bore_squared x stroke x cylinders. The Cummins 6.7-liter ISB diesel has a 4.213-inch bore and 4.882-inch stroke with 6 cylinders: (PI/4) x 4.213 x 4.213 x 4.882 x 6 = 408.3 cubic inches = 6,691 cc = 6.69 liters (marketed as “6.7L”). The Duramax 6.6L LLY V8 diesel has a 4.055-inch bore and 3.897-inch stroke with 8 cylinders: 402.9 CID = 6,605 cc = 6.60 liters (marketed as “6.6L”). Diesel engines typically use longer stroke relative to bore (undersquare configuration) to generate high torque at the low RPM that diesel combustion requires. Enter any diesel’s bore and stroke into Mode 1 to calculate exact CID, liters, and CC.
A .030-inch overbore on a V8 adds approximately 4 to 6 cubic inches of displacement depending on the original bore and stroke dimensions. For a Chevy 350 (4.000″ bore, 3.480″ stroke, 8 cylinders): stock CID = 349.85. With .030 over (4.030″ bore): 354.71 CID — a gain of 4.86 cubic inches. For a BBC 454 (4.250″ bore, 4.000″ stroke): stock = 453.96 CID. With .030 over (4.280″ bore): 461.31 CID — a gain of 7.35 cubic inches. The larger the original bore, the more cubic inches each thousandth of overbore adds, because bore appears squared in the formula. Use Mode 1 with the overbore field to calculate exact gains for any combination.
The Ford 7.3-liter Godzilla V8 (445 cubic inches) is the largest factory V8 currently in production for a US passenger vehicle or light truck, used in the Ford Super Duty F-250 through F-600 trucks and the Ford Bronco R performance truck. Among engines that have been offered in US passenger cars, the Chrysler 426 cubic inch HEMI (1964-1971) was one of the largest factory passenger car engines and remains one of the most famous. The Chevrolet 454 big block at 454 cubic inches held the displacement record for factory Chevy trucks for decades. The Dodge Viper’s V10 at approximately 505 cubic inches (8.3L, later 8.4L) holds a special position as the largest factory US sports car engine in modern history. Enter any of these engines’ bore and stroke in Mode 1 to see their exact specifications.
Different bore and stroke combinations can produce the same total displacement but result in entirely different engine characters. The Ford 302 (4.000″ bore, 3.000″ stroke) and the Ford 5.0 Coyote (3.630″ bore, 3.650″ stroke) both calculate to approximately 302 cubic inches, but one is highly oversquare (1.33:1 ratio) and the other is nearly square (0.994:1 ratio). The classic 302 was designed for a certain power band; the Coyote was optimized for a completely different goal while maintaining the same displacement for marketing continuity. Similarly, the Chevy 305 (3.736″ bore, 3.480″ stroke) achieves 305 CID with a different bore/stroke ratio than the 350 (4.000″ bore, 3.480″ stroke). Same stroke, different bore — different character. The bore/stroke ratio analysis in Mode 1 explains what each configuration means for the engine’s power delivery.
Use Mode 2 (Solve for Bore/Stroke). Enter 383 CID as the target, 3.750 inches as the known stroke, 8 cylinders. The calculator solves: bore = sqrt(383 x 4 / (PI x 3.750 x 8)) = sqrt(1532 / 94.25) = sqrt(16.255) = 4.032 inches. So a 4.032-inch bore with a 3.750-inch stroke and 8 cylinders yields exactly 383.0 CID. The classic .030 over SBC bore (4.030″) with a 3.750 stroker crank gives 382.65 CID — close enough to call it a 383. Confirm your specific combination by entering actual bore and stroke in Mode 1 to see the exact displacement figure for your engine documentation.
Displacement (CID, liters, or CC) is the total swept volume of all pistons — the volume of air-fuel mixture the engine can ingest per cycle. Compression ratio is the ratio of the total cylinder volume (displaced volume plus clearance volume above the piston at TDC) to just the clearance volume at TDC. A 350 CID engine with a 9:1 compression ratio takes 350 cubic inches of charge and compresses it to approximately 1/9th of that volume. The same 350 CID engine built with flat-top pistons instead of dished pistons and smaller combustion chambers might have a 10.5:1 compression ratio — same displacement, higher compression. Displacement tells you how much the engine breathes; compression ratio tells you how much it squeezes. Both affect power output, but they are independent variables that can be adjusted separately during an engine build.
Larger displacement allows more air-fuel mixture per cycle, which produces more work per combustion event. All else being equal, more displacement means more potential horsepower and torque. However, the relationship is not linear and depends heavily on efficiency factors. A well-designed 350 CID engine with good cylinder heads, a proper camshaft, and precise fuel delivery can make more power than a poorly built 454 with restrictive stock equipment. The bore/stroke ratio determines where in the RPM range the displacement is most efficiently used: oversquare engines extract their displacement’s potential at high RPM, while undersquare engines extract it at low RPM. Modern turbocharged 4-cylinder engines like the 2.3-liter EcoBoost (140 CID) demonstrate that displacement is only one factor — they produce performance comparable to naturally aspirated V8 engines of much larger displacement by using forced induction to multiply the effective air intake well beyond what the physical displacement would allow.
Engine displacement calculations use the standard industry formula: Displacement = (PI/4) x bore_squared x stroke x cylinders. This formula is universal and used by all major US engine manufacturers, racing organizations (NHRA, NASCAR, SCCA), and the SAE International (Society of Automotive Engineers). Bore and stroke values for famous engines in the database are sourced from publicly available factory service manuals and engineering specifications. Minor rounding differences may exist between calculated displacement and factory-stated displacement due to marketing rounding conventions.
Overbore and stroker calculations use the same formula with modified bore and stroke inputs. Maximum overbore specifications for any specific engine block should be verified with a professional machinist before machining. Engine builder decisions including overbore amounts, bearing sizes, and component compatibility should always be confirmed by a qualified automotive machinist or engine builder. Editorial transparency: No engine parts manufacturer, machine shop, or automotive retailer paid to influence the content or engine reference data on this page.