LS EngineBuilder
Plan your perfect LS swap or high-power build in real time. Pick your base engine, add performance parts, and see live HP, torque, and cost estimates.
See a complete high-power build in seconds
Three Steps to Your
Perfect Build
Pick Your Engine
Choose from 15 LS variants — LS1 through LS9, truck motors, and everything in between. All factory specs pre-loaded.
Add Performance Parts
Browse 363+ parts across 8 categories: shortblock, heads, cam, intake, fuel, forced induction, exhaust, and supporting mods.
See Live Results
Watch HP, torque, and cost update in real time. Get smart warnings, compression analysis, and a full build report.
Everything You Need
To Plan Your Build
Live Power Curves
Real-time HP & torque graph
363+ Performance Parts
From shortblock to exhaust
Engineering Calculators
CR, VE, BSFC, and more
Live Power Curves
Interactive HP & torque graph that updates instantly as you add or remove parts. See exactly where your power band sits.
17 Engineering Calculators
Static CR, dynamic CR, rod ratio, quench distance, piston-to-valve, mean piston speed, VE, BSFC, and more.
EFI Tune Simulator
Simulate timing advance, AFR targets, and boost levels. See how tune changes affect your estimated power output.
Smart Compatibility Warnings
Automatic alerts for risky combos — high CR on pump gas, cam/head mismatches, undersized fuel systems, and more.
Build Optimizer
AI-powered suggestions for your next best upgrade. Maximizes HP per dollar based on your current parts selection.
Shopping List + Links
Running cost tracker with direct links to Summit Racing and Jegs for every part. Export your full build as a PDF report.
Community
Spotlight
Every week we highlight an outstanding build from the LS Engine Builder community.
Blown LS2 Swap
Built by Sarah K.
2.3L TVS supercharger on forged rods making 750 HP at 9 PSI — a reliable street/strip monster in a G-body.
Key Parts
What Builders Are
Creating
Real builds planned with LS Engine Builder. Click "Load Demo" above to try the Turbo LS3 yourself.
Street Turbo LS3
76mm turbo, forged internals, E85 tune
NA Screamer LS7
CNC ported heads, solid roller cam, ITBs
Budget LS1 Build
Cam swap, headers, intake, tune
Blower LS2 Swap
2.3L TVS blower, forged rods, 9psi
Ready to Build
Something Serious?
No account required. No cost. Just pick an engine and start adding parts.