Sleeper 1964 Holden EH Premier hides a 600 HP Godzilla Six under its unassuming hood

Often we see classic cars replaced with more modern engines to give the vehicle more character or power, but they usually tend to be similar to the original engine in spirit. That’s exactly why this 1964 Holden EH Premier is so fascinating, as it has a heavily modified straight-six engine from a Nissan Skyline crammed into its engine bay.

The car is listed on Australian Muscle Car Sales with an asking price of AU$99,500 ($70,680), and the engine in question is not a typical RB straight-six from the more popular GT-Rs. from Nissan, it’s more of a Frankenstein engine called an RB26/30. This mix-and-match engine uses the bottom end of the RB30E and the head of an RB26 to combine their most desirable performance characteristics.

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And on top of that, the one in this car is modified to deliver over 600 bhp (608 PS / 447 kW), which is more than five times more power than this Holden made from stock. Some of the modifications include an upgraded turbocharger, custom forged pistons, new rods and cams, custom extractors and a stainless steel exhaust system.

But if you thought the car was fully motorized, you’d be very wrong. It also has all the necessary modifications to handle the power and make it fun to drive. These include a reinforced chassis, new steering rack, improved brakes, new transmission and shifter, stronger axles and a new differential. Inside, there’s a six-point roll cage, new steering wheel, new gauges and racing seats with harnesses. The only real giveaway of this car’s performance are the new wheels mounted on semi-slick tyres, but these are decent enough not to notice.

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