V12LS — Engine Builder Kit
V12LS
An extreme platform for your machine shop to build on
The Platform
Engine builder kit
Ready for your machine shop to work with.
- 1.5×
- HP of an equivalent V8
- 564ci / 9.2L
- Displacement
- 8.8"
- Longer than an LS V8
- 90°
- Bank angle
- odd-fire, neutrally balanced
Kit & Pricing
Alloy engine builder kit
A$56,600
Base kit price.
Kit includes
- Machined alloy block — 4.065" bore (LS3-sized)
- Billet 3.622" stroke crankshaft
- LS7-port hybrid heads, accept LS3 components
- Custom grind camshaft
- Valve covers
Upgrade options
- Assembled heads
- Low-profile sheet metal intake and fuel rails
- Harrop Hurricane ITB Intake
- 3.9" stroke crankshaft
- Wet sump
- Dry sump
- Custom sumps and intakes
Resources
Technical documents
Specs, torque procedures and drawings for the V12LS platform.
Build Gallery
Photo: Street Machine
Achievement Showcase
900hp at 6600rpm, 800lb-ft at 4700rpm
A hi-po stroker build that pushed the V12LS to over 900HP on the dyno.
Built for long-time customer Craig Ruth of Cheetah Evolution (USA), who bought the very first production V12LS and has now upgraded V12LS001 to this higher-output unit for a bespoke aluminium supercar of his own design.
This particular engine stroked to 3.9" versus the standard kit's 3.622", 607ci / 9.94L — built to explore the top end of what the platform can do.
Read the full build story at Street Machine.
FAQ
Frequently asked questions
How much horsepower does the V12LS make?
Typically around 1.5x the horsepower of an equivalent-spec V8. Naturally aspirated, the platform makes 750hp on a mild 228/238 street cam, and up to 900hp with a larger cam and upgraded valvetrain.
How much does the V12LS weigh?
The alloy long motor weighs 191kg — about 11kg heavier than an equivalent alloy LS1 long motor (179kg), lighter than an iron 6.0L LS long motor (215kg), and well under an iron big-block Chev (311kg).
What is the firing order of the V12LS?
The same as Ferrari and most other V12s — effectively two inline-6s with one bank reversed.
What is the bank angle of the V12LS?
The block angle is 90 degrees and is odd-fire.
Is an odd-fire engine balanced?
Yes — a V12 has neutral primary and secondary balance at any bank angle.
Will the V12LS fit my project car?
The V12LS is only 8.8 inches longer than an LS V8, around the length of many straight-6s. It suits most vehicles that came with a V8 or I6 option.
Will I need a larger radiator?
It depends what you run now, but we recommend sizing the radiator as if fitting a 700+hp big-block Chev.
Is this engine two blocks welded together?
No. Only Race Cast's original prototype — built roughly a decade ago to prove the concept — was made from two welded LS1 blocks. Every production V12LS is cast as a one-piece block and heads from our own patterns.
What displacement is the V12LS?
The alloy V12LS is 564ci / 9.2L.
Can I get a custom grind camshaft?
Yes — we can grind a camshaft to your specification, or ours.
Can I order a turn-key V12LS engine?
Race Cast supplies the engine builder kit — your engine builder, or one of our recommended machine shops, completes assembly. Staying kit-only lets us focus on what we do best: precision casting and machining.
Enquire
Start your V12LS build
Tell us about your project and we'll get back to you about kit availability and lead times.