Speed Secrets: Chevy Big Block Boost to 900+ HP

Does it get any better than a boosted Big Block? It’s hard to imagine anything better! On this episode of Speed Secrets, the team works with COMP Cams to find out how to get the best results out of a Big Block engine that’s destined to get boost.

For this test of junkyard, boosted Big Block Chevys, a gen-six 454 is enlisted as the guinea pig. This engine came out of the engine bay of a full-size Suburban SUV. What’s great about this engine is that its a four-bolt main with hydraulic roller cam – it also came with large oval port heads.

While changing the cylinder heads, intake, and camshaft have become common fair for these junkyard test engine, this engine is also getting added ring gap. See, when someone breaks a piston under boost, it’s not always the pistons themselves that crack, it’s often failure at the ring gap. After that comes modifications to take it from 300-horsepower to 512-horsepower for a strong N/A engine base.

Getting it to the right power range before boost means a set of cast aluminum heads, a single plane EFI intake, and a custom ground cam – the cam features a .561 lift, a 233/239 duration, and a 118 LSA.

After installing a S480 turbo and air-to-water intercooler on the engine, a cautious 10 PSI is feed to the engine. This got the power up to 818-horsepower and 819 lbs/ft of torque. After that, 12.6 PSI boost was tested where the engine reached 914-horsepower and 909 lbs/ft of torque.


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