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Big Block Engines

Big Block Engines

For half a century, Chevrolet’s big-block engines have set the bar for big torque and the power that comes with it – whether you’re hauling down the drag strip in a 9-second Camaro or hauling that Camaro to the drag strip in your truck.

Chevrolet Performance is the only source for brand-new big block crate engines built with brand-new parts – and each is built with the latest cylinder block casting, which is stronger in many key ways to previous production engines. Save yourself the trouble of rebuilding or even finding a good, rebuildable core.

Our lineup of assembled, ready-to-install engines offers something for every budget and project – and you’ll be on the road quicker, with little or no time required for fine-tuning. Use our classic 454 HO for your classic cruiser, our 502 HO to re-power your truck for great towing capability. Our 427 crate engines make great additions to classic Corvettes and COPO Camaro tributes, while racing engines like the ZZ572/720R arm your drag racer with formidable firepower!

When you need big torque, look no further. Nobody knows big-blocks like Chevrolet Performance!

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  1. Chevrolet ZZ502/502 Deluxe Crate Engine

    Chevrolet ZZ502/502 Deluxe Crate Engine

    Excl. Tax: £7,495.00 Incl. Tax: £8,994.00
    Our most popular big-block crate engine for the street and strip! GM Performance Parts’ ZZ502/502 is one of the industry’s benchmark crate engines, offering excellent value with a proven combination of performance that is suitable for the street or strip. Learn More
  2. Chevrolet ZZ572/620 Deluxe Crate Engine

    Chevrolet ZZ572/620 Deluxe Crate Engine

    Excl. Tax: £9,995.00 Incl. Tax: £11,994.00
    We build the ZZ572 with huge 4.560-inch bores and add a forged 4.375-inch-stroke crankshaft. To make sure those cylinders are packed with every cubic centimeter’s worth of atmosphere, we use a camshaft with incredible 0.632/0.632-inch lift and 254°/264° duration specifications. Learn More
  3. Chevrolet ZZ572/720R Deluxe Crate Engine

    Chevrolet ZZ572/720R Deluxe Crate Engine

    Excl. Tax: £12,995.95 Incl. Tax: £15,595.14
    A 10-second car is quick, but the ZZ572/720R could achieve that with a couple of its spark plugs left in the pits. It is the king of all Rat engines and is capable of pulling your bracket racer or heads-up challenger down the 1320 in the 9-second range. Learn More

    Out of stock

  4. 12568774

    GM 454HO 425HP CRATE ENGINE

    Excl. Tax: £5,995.00 Incl. Tax: £7,194.00

    The 454 HO offers tremendous value in a big block crate engine.

    Based on the Gen VI 4-bolt mains with 1-piece rear main seal blocks with approximately

    • 8.75:1 compression
    • 438 hp at 5,300 rpm
    • 500 ft./lbs. of torque at 3,500 rpm
    • The "HO" stands for High Output
    Learn More
  5. 502 HO Big Block Crate Motor

    502 HO Big Block Crate Motor

    Regular Price: £8,098.80

    Special Price Excl. Tax: £6,495.00 Incl. Tax: £7,794.00

    Big-Block performance 

    With 461 horsepower and 558 lb.-ft. of torque, our 502 HO crate engine has power on tap for every need — from a ’69 Chevelle to a newer Suburban.

    Learn More
  6. ZZ427 480HP Big Block CRATE ENGINE

    ZZ427 480HP Big Block CRATE ENGINE

    Regular Price: £10,794.00

    Special Price Excl. Tax: £8,350.00 Incl. Tax: £10,020.00

    Chevrolet Performance has recreated the classic L88 Big-Block combination in the ZZ427/480 crate engine. Rated at 480 horsepower, it features an iron block, forged steel crankshaft and high-flow aluminum cylinder heads. An upgraded hydraulic roller camshaft improves drivability and PRM range while lower 10.1:1 compression means you can enjoy the power on pump gas too. The ZZ427 comes complete with high-flow oval port heads, a high-lift camshaft, an aluminum intake manifold, 770cfm Holley carburetor, an HEI distributor, aluminum water pump, balancer, spark plug wires and a 14in flexplate. If you're looking for a modern version of the classic L88, the Chevrolet Performance ZZ427/480 Crate Engine is the answer

    Learn More
  7. ZZ454 469BHP Engine w/ Aluminum Heads Crate Motor

    ZZ454 469BHP Engine w/ Aluminum Heads Crate Motor

    Excl. Tax: £5,895.00 Incl. Tax: £7,074.00

    Chevrolet Performance engineers took the 454 HO - with its super-tough, all-forged reciprocating assembly - and matched it with a set of higher-flow, oval-port aluminum cylinder heads to pick up an additional 30 horses, while still offering 519 ft/lbs of torque. They dubbed it the ZZ454/440, and it's an affordable high-performance Big-Block for any chassis you can stuff it in.

    The ZZ454/440 uses the new cylinder block casting for greater strength and performance, while the aluminum heads use smaller, 110cc combustion chambers to boost compression to 9.6:1, up from 8.5:1 on the 454 HO. Then matched the airflow capability with a high-lift, hydraulic roller camshaft that delivers great idle quality and requires no periodic lash adjustments.

    This crate engine package includes the ZZ454/440 assembled with a water pump, balancer, aluminum intake manifold, and a 14-inch flexplate. To simply finish up this package, you will need a carburetor, starter, ignition system, and other accessories. Don't sweat it, JEGS has all the components you need to get this big-power Big-Block started.

    Learn More
  8. HT502 Engine Assembly Crate Motor

    HT502 Engine Assembly Crate Motor

    Excl. Tax: £4,995.00 Incl. Tax: £5,994.00
    These Chevrolet Performance HT502 engines offer tremendous value in a big block crate engine. They're based on the Gen VI 4-bolt mains with 1-piece rear main seal blocks. Learn More

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