Chevy Engine Swap Compatibility Chart: LS, LT and Small-Block Fitment

Chevy engine swap compatibility is not one rule, it is a stack of four: which engine generation you are holding (Gen II, III, IV or V), which crank trigger and cam sensor it uses, how it gets fuel, and which controller can run it. This chart groups Chevy engines by what actually has to match, using Chevrolet Performance installation sheets, GM specification tables and EPA policy, so you can tell in a few minutes whether a donor engine suits your project or needs a different plan.

Chevy Engine Swap Compatibility Chart

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Read this chart by family, not by model name. Two different engines can wear the same badge: the 1992 Gen II LT1 and the 2014 Gen V LT1 share a name and nothing else GM documents. Start with the family below, then check the specification table that follows.

Engine family	When GM documents it	Crank trigger and cam sensor	Fuel and control notes
Gen II LT1	1992 Corvette; revised in 1994	Not covered by LS controller kits	GM describes a reverse-flow cooling system and, from 1994, speed-density fuel management with batch-fire injection. Same “LT1” name as the Gen V engine below, different engine.
Gen III LS (LS1, LS6, early truck V8s)	LS1 in 1997, LS6 in 2001	24x crank trigger, cam sensor at the rear of the block (LS1, LS6, LQ4, LQ9 and the 4.8, 5.3 and 6.0 truck engines through 2006, per PSI Conversion)	Early Gen III engines use a cable throttle body and later ones an electronic one, per LSXmag. Coil-near-plug ignition from the start, per GM.
Gen IV LS (LS2, LS3, LS7, L76, L92, 2007 and newer trucks)	Gen IV introduced in 2005; LS3 in 2008	58x crank trigger, cam sensor in the front cover, per PSI Conversion	Chevrolet Performance builds its LS control kit for 58x reluctor wheels, 4x cam indexing and electronic throttle, “typically 2006 and newer”. Fuel: 400 kPa (60 psi) constant, 40 gph for LS2 and LS3, 50 gph for LS7.
Gen V (LT1, EcoTec3 truck engines)	LT1 revived in 2013 and 2014; L83 in the 2015 Silverado	58x ignition; Chevrolet lists “Quick Sync 58X” on the L83	Direct fuel injection, variable valve timing and Active Fuel Management on the 2015 L83. The LT1 crate engine needs a 72 psi (500 kPa) lift pump feeding an on-engine high-pressure pump.

Engine mounts, the oil pan, the transmission bellhousing and the crossmember depend on your exact chassis and swap kit, so we do not list them here. Our Chevy bellhousing and transmission compatibility guide covers that side.

Same Bore and Stroke, Different Engine: LS3, LT1, LS7 and L83

Chevrolet Performance lists the LS3 and the LT1 as the same size on paper: 376 cubic inches and a 4.065 x 3.622 inch bore and stroke. That is the trap. The LS3 is port-injected at 10.7:1, the LT1 is direct-injected at 11.5:1, and the oil capacity differs by almost a factor of two. Even the 2015 truck engines share the 3.62 inch stroke, yet each belongs to a different tuning and fuel setup. Dimensions say whether a block is the same size, not whether it will run on your wiring.

Engine	Family	Displacement	Bore x stroke	Compression	Fuel delivery
LS3 (crate)	Gen IV	376 cu in (6.2L)	4.065 x 3.622 in	10.7:1	Port injection, constant 58 to 60 psi (400 kPa), 45 gph pump
LS7 (crate)	Gen IV	427 cu in (7.0L)	4.125 x 4.0 in	11.0:1	Port injection, 58 psi (400 kPa), minimum 50 gph
LT1 (crate)	Gen V	376 cu in (6.2L)	4.065 x 3.622 in	11.5:1	Direct injection, 72 psi (500 kPa) supply at 45 gph, relief set at 84 psi
L83 (2015 Silverado)	Gen V (EcoTec3)	325 cu in (5.3L)	3.78 x 3.62 in	11.0:1	Direct injection with Active Fuel Management
LV3 (2015 Silverado)	Gen V (EcoTec3)	262 cu in (4.3L V6)	3.92 x 3.62 in	11.0:1	Direct injection with Active Fuel Management

Which Engine GM Put in Which Platform

These are the factory applications GM itself documents in its engine history pages and specification tables. They show what each engine was designed to run with, which is the safest guide to its wiring and fuel needs.

Platform	Engine GM documents	Detail from GM
Corvette, Camaro, Firebird	L98 350 (1985)	Tuned port injection added to the L98 350
Corvette	Gen II LT1 (1992)	Reverse-flow cooling for higher compression
Corvette and Camaro	LS1 (Corvette from 1997)	First Gen III engine, all-aluminum, GM says for Corvettes and Camaros
Corvette Z06 and Cadillac CTS-V	LS6 (2001)	LS1-based with improved heads, camshaft and higher compression
Corvette	LS3 (2008)	6.2L, up to 436 horsepower with specific enhancements
Corvette ZR1	LS9	638 hp and 604 lb-ft of torque
Camaro ZL1 and Cadillac CTS-V	LSA	Detuned LS9, up to 556 horsepower
Corvette	Gen V LT1 (2014)	460 hp and 465 lb-ft of torque, direct injection
Silverado 1500 (2015)	LV3 and L83	285 hp and 355 hp on gasoline, SAE certified

Our Chevy 4.8 vs 5.3 comparison covers the truck V8 choice in detail, and the Active Fuel Management delete guide explains the cylinder deactivation hardware mentioned above.

What Actually Decides Whether a Chevy Swap Works

Most failed swaps are electrical or fuel problems, not bolt-pattern problems. Work through this checklist for any donor engine before you pay for it.

Check	Why it matters	What the maker documents
Crank trigger and cam sensor	A controller expects one trigger pattern. A Gen IV engine in a Gen III setup needs a signal converter and a front-cover cam sensor harness.	24x with a rear cam sensor on Gen III, 58x with a front cam sensor on Gen IV. LSXmag names a Lingenfelter 58x-to-24x converter for the mismatch.
Throttle	Electronic throttle needs the matching pedal and controller.	The Chevrolet Performance LS kit includes an accelerator pedal and runs electronic throttle control.
Fuel system	Port-injected LS engines and direct-injected LT engines need different pressure and pumps.	LS3 about 58 to 60 psi; LT1 72 psi with an 84 psi relief; LS7 needs at least 50 gph.
Controller and harness	A bare crate engine does not run on its own.	Chevrolet says the LS3 crate engine requires a control system and harness, and ships without flexplate, starter, fuel pump or exhaust manifolds.
Oil capacity	Capacity hints at the pan and sump layout you must clear in the chassis.	LS3 5.5 quarts with filter, LT1 10.0 quarts with filter, LS7 10.5 quarts as a minimum tank size.
Cylinder deactivation	Engines with Active Fuel Management carry extra hardware.	Chevrolet Performance disables the feature in its LT1 controller kit, but the hardware stays on the engine.

Gather the tools first: an engine hoist rated for the engine and a vehicle service manual for the chassis. Study the Chevy ignition wiring diagram before cutting any factory wiring.

Emissions Law: Check It Before You Buy the Engine

EPA’s Engine Switching Fact Sheet states the federal rule: installing a light-duty engine in a different light-duty vehicle is considered tampering unless the finished vehicle is identical, in all emission-related parts, engine design parameters and calibrations, to a certified configuration of the same or newer model year as the chassis, or there is a reasonable basis for knowing emissions are not adversely affected. It says the vehicle manufacturer is the source for certified configuration data. That document is from 1991, so confirm the current federal and state rules for your vehicle.

Chevrolet says the same thing in practice. Its LS3 crate engine installation sheet notes that the publication pertains to engines and vehicles used off public highways except where noted, and that federal law restricts removing federally required emission controls. GM’s own history page says the LS3 E-Rod, shown in 2009, was the first crate engine street-legal in all 50 states, so an emissions-compliant package exists for some projects.

Safety Limits for Engine Swap Work

Chevrolet’s installation sheet tells installers to support the vehicle securely with jack stands, use proper tools, and use extreme caution with flammable, corrosive and hazardous liquids. It adds that if you lack the training, expertise and tools to do any part of the conversion safely, a professional should do that work. The same sheet says a new crate engine must be primed with oil before it is started.

Direct-injection engines add one more risk: the LT1 sheet describes a high-pressure fuel pump on the engine and a pressure relief on the supply line. Do not open fuel lines on a running or recently run engine, and have a professional handle fuel system work you are unsure about. Stop and get help if you smell fuel, see a leak, or cannot get a stable oil pressure reading on first start.

What This Chart Leaves Out, and Why

An earlier version of this page listed direct-fit years for every Chevy model and a horsepower figure for each engine. We removed rows we could not trace to a maker document, because a wrong mount or year claim costs you a weekend and a core engine. We also dropped salvage-yard prices, which vary by region and year. What remains is limited to family differences and specifications that GM publishes. For four-cylinder Chevys such as the Sonic, Cruze or Spark, this chart does not apply: identify your exact engine code and use a GM parts catalog or your dealer before comparing donor engines.

Frequently Asked Questions

How to check engine swap compatibility?

Check six things in this order: the exact engine family and year (Gen III, IV or V), the crank trigger and cam sensor layout, the throttle type, the fuel pressure the engine needs, the control module and harness you will run, and the oil pan or oil tank layout against your chassis. Then check the emissions rule for your state before buying. Use the checklist table above, and confirm mounts and transmission fit with the maker of your swap kit.

Is a Chevy 5.3 an LS?

It depends on the year. Earlier 5.3L truck engines belong to the Gen III and Gen IV LS family, and the 24x versus 58x crank trigger split follows the 2006-2007 line. The 5.3L L83 in the 2015 Silverado is a different design: GM lists it with direct fuel injection, variable valve timing and Active Fuel Management, so treat it as the Gen V family and do not mix its parts with an LS3 kit.

Can an LS3 and an LT1 share parts?

Not much beyond the dimensions. Chevrolet Performance lists both as 376 cubic inch engines with a 4.065 x 3.622 inch bore and stroke, but the LS3 is a Gen IV port-injected engine at 10.7:1 compression and the LT1 is a Gen V direct-injected engine at 11.5:1. They need different fuel systems, different controllers and different oil capacity.

Do I have to keep the emission controls in an engine swap?

In general, yes. EPA treats installing a light-duty engine in a different light-duty vehicle as tampering unless the finished vehicle matches a certified configuration of the same or newer model year as the chassis, or there is a reasonable basis for knowing emissions are not adversely affected. That policy document dates from 1991, so check current EPA and state rules before you start.