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Improve reliability under extreme driving conditions
12-point Style
GM 243/799 Heads
Holley EFI Terminator X Max - Gen IV
JourneyHQ 427 LS Swap Package Performance Engine Improve reliability under extreme drivingBuilt through a collaboration between Boostline Performance and Journey HQ, this turn key 427 LS package combines our proven Darton sleeved aluminum block with carefully selected components to deliver serious performance and reliability. Featuring a 4. 125" bore and 4. 000" stroke, the 427 is a torque hungry beast that excels in everything from street cars and trucks to dedicated performance builds. The large bore allows for high flow cylinder heads
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