The journey of the '85 GT continues with a shift in focus. While a turbo was initially planned, the build has pivoted towards a high-compression, naturally aspirated setup. This approach prioritizes instant throttle response and high-RPM reliability in the mid-engine chassis.

The High-Compression Pivot:

To achieve maximum N/A performance, the LQ4 iron block is being paired with LS2 (243 casting) heads. These heads significantly increase the compression ratio, providing the "squeeze" needed to make big power without the complexity of a turbo setup.

LS Build Specifications

Component	Specification
Engine block	6.0L LQ4 Iron Block
Heads	LS2 (243 Casting) High Compression
Camshaft	Elgin 1840p "Sloppy Stage 2" (228/230 dur)
Management	MS3 Gold Box Standalone
Fueling	Walbro 450 Pump / 80lb Injectors
Exhaust	Custom 3" Stainless Headers
Transmission	Fiero Getrag 5-speed

Cradle & Integration

The Fiero cradle was heavily modified and reinforced to support the weight and torque of the 6.0L iron block. The setup uses a custom Archie flywheel and adapter plate to mate the LS to the Fiero 5-speed transaxle.

Precision Engineering: 243 Heads & MS3

Beyond raw power, I'm focusing on high-end components to ensure reliability and peak N/A performance.

Pairing the 243 casting heads with the MS3 Gold Box allows for surgical control over the engine's timing and fueling, maximizing the benefits of the increased compression ratio.

The LS Sound

With the 230 duration cam and stainless headers, this 6.0L build sounds absolutely menacing at idle and roars under load. It's a technical showcase of "Old School" car guy expertise meeting "New School" EFI control.