CT525 6.2L Crate Engine (19171821) BIG POWER in a small-block package! Designed for racing classes requiring more power than our proven CT350, CT355 and CT400 Gen I based racing engines, the all-new CT525 delivers the goods! It is an ideal engine for Super Late-Model-type cars. Based on the latest production version of the now-famous Gen IV LS family of GM small-blocks that power the C6 Corvette, the CT525 is destined to set a new standard for afordable power. Aluminum block and heads, hypereutectic aluminum pistons, nodular iron crank and hydraulic roller tappet camshaft churn out an impressive 525 horses in a bullet-proof race-proven package. The recent design changes that have produced the power-building rectangular port cylinder head design, also create a torque-y, yet relatively high revving engine. The CT525 fills the "Need for Speed" at a surprisingly affordable price. The CT525 uses a conventional four-barrel carb, individual runner manifold, retaining the factory coil-near-plug ignition design. CT525 6.2L Tech Specs: Part Number: 19171821 Engine Type: LS Series Gen IV small-block V8 Displacement (cu in): 376 Bore x stroke (in): 4.06 x 3.62 (103.25 x 92mm) Block (P/N 12584727): Cast aluminum with 6-bolt, cross-bolted main caps Crankshaft (P/N 12597569): Nodular iron Connecting rods (P/N 12617570): Powdered metal Pistons (P/N 19165089): Hypereutectic aluminum Camshaft type (P/N 12480110): Hydraulic roller Camshaft lift (in): .525 intake/.525 exhaust Camshaft duration (@ .050 in): 226° intake/236° exhaust Cylinder heads (P/N 12598594): LS3 rectangle port; as-cast with 68cc chambers Valve size (in): 2.16 intake/1.59 exhaust Compression ratio: 10.7:1 Rocker arms (P/N 12569167 int): Investment cast; roller trunnion Rocker arms (P/N 10214664 exh): Investment cast; roller trunnion Rock arm ratio: 1.7:1 Recommended fuel: 92 octane When fitted with a 750-cfm four-barrel carburetor (not included), the CT525 is rated at 525 horsepower and 471 lb.-ft. of torque, with a maximum engine speed of 6,700 rpm.