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Summary of Contents for Chevrolet CT525
- Page 1 CT525 CIRCLE TRACK RACING ENGINE TECHNICAL MANUAL...
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Page 2: Table Of Contents
Flywheel, Starter, and Fuel Pump Requirements ------------------------------------------ Pg. 19 Engine Specifications ----------------------------------------------------- Pg. 20 Service Parts List --------------------------------------------------------------------- Pg. 21 CT525 Crate Engine ------------------------------------------------------------------- Pg. 22 This Technical Manual is dedicated to the memory of Robert E. (Bob) Cross 1957-2010... -
Page 3: Introduction, Legal Information & History
In the V-8. This engine is then up-fitted with a Circle Track 1960’s, Chevrolet started producing HD parts for racing Racing Oil Pan, Open Plenum Carbureted 4 barrel Intake activities and a whole industry was started. -
Page 4: Position Statement, Where To Buy, Warranty
Circle track crate engines can be purchased from any GM Dealer in the USA, Canada and other countries. Our recommendation is to contact an authorized Chevrolet Performance Parts dealer which is more familiar with GM’s high-performance parts line. Contact 1 (800) 468-7387 or www.chevroletperformance.com to find a dealer near you. -
Page 5: Engine Package Overview
GM 525 CIRCLE TRACK PACKAGE Engine Specifications The LS3 CT525 engine package was developed off the powerful production Corvette LS3 engine package and is sold as P/N 19434598. It is sold complete, intake to oil pan, including coil packs. It does not include the ignition system, fuel pump, wiring, exhaust manifolds or water pump. ... -
Page 6: Engine Priming, Start Up And Break In Instructions
RECOMMENDED BREAK-IN PROCEDURE Start-up is critical to help ensure engine life. This procedure was written with the intent to provide a quick reference and guideline to starting a new or rebuilt engine if a dynamometer (dyno.) is not available. If you are using a dyno., refer to the dyno operator’s guidelines for start up and initial break in of the engine. - Page 7 RECOMMENDED BREAK-IN PROCEDURE (CONTINUED) 5. Install the flexible hose to the adapter and open the valve. 6. Pump the handle on the J45299 preluber in order to flow a minimum of 1-1.9 liters (1-2 quarts) engine oil. Observe the flow of engine oil through the flexible hose and into the engine assembly.
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Page 8: Sealing System
The CT525 Circle Track Crate engines are sealed from the factory with four anti-tamper bolt cover assemblies. The CT525 Circle Track engine is fitted with the seal assemblies on the intake manifold, front cover, and oil pan. These are specially designed to deter access to internal engine components. GM Replacement bolt cover assemblies are not sold to the public. - Page 9 ENGINE COMPONENTS (CONTINUED) Crankshaft LS3 engine had a cast iron crankshaft with rolled fillets and one-piece rear seal. Stroke is the same as other cranks, 3.62". The thrust is located on # 3 main or the center of the crank. Main journal size is 2.558"...
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Page 10: Camshaft
ENGINE COMPONENTS (CONTINUED) Cam Shaft The camshaft is a hydraulic Roller design. It is made from Billet steel. The camshaft specifications were developed from the original LS-1 ASA program. The cam specifications are .226 intake & .236 exhaust duration @ .050" lift and .525"... -
Page 11: Timing Chain + Gears & Front Covers
The LS3 uses gear. The camshaft gear is replaced in the CT525 as 4X timing gear along with a 58x crank gear for package with the 2006 LS2 3 bolt 4X cam gear precise timing control. -
Page 12: Pushrods +Rocker Arms & Lifters
The LS3 engine uses the Bee-Hive style valve spring which is superior to other type springs for this application. It is lightweight and can control the valve train very well. The original CT525 was built with a yellow valve spring, and later changed to a blue spring due to part availability. In late 2020, the spring color was changed to a natural color with an ivory stripe. -
Page 13: Ignition System
(CONTINUED) Ignition System 4. Program the upper Map grid to Zero timing. The CT525 uses production LS3 coils along with an ignition box P/N 19355863. The ignition box 5. Then set both high and low Rev Limits to 6600 will need to be programmed with a laptop for RPM. -
Page 14: Plugs, Wires & Boots
GM puts 5W-30 Mobil 1 oil in the stock LS3 as delivered in the Corvette. 0W-40 Mobil 1 (oil must meet Dexron R specification) oil is the recommended oil for the CT525 circle track engine package. Fig 6 14 |... - Page 15 ENGINE COMPONENTS (CONTINUED) Oil Filter Requirements Oil Level. Oil level is critical to proper engine life. When engine oil is full, the oil will just touch the bottom of the access bolt on the RH side of the pan. Make sure you use the largest filter you can with (Fig 7a &...
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Page 16: Balancers
See Fig 14. An ATI Balancer, P/N 917279, with special durometer The CT525 crank is drilled from the factory and a rubber is included and recommended for circle track 3/16" x .500" (.185") pin is installed. This secures applications. -
Page 17: Cooling System
Surge Tank. A Surge or Expansion tank with the CT525 package must be used. It can be attached to the RH bar above the water pump thermostat. The bottom of the surge tank should be hooked to the front heater hose outlet. -
Page 18: Intake Manifold + Carburetor + Breather
See Fig 17. Fig 18 Breather Requirements The CT525 package comes with a left-hand valve cover that has been modified with two -16 AN male fittings welded into the cover. The rear fitting utilizes the valve cover baffle, while the front fitting is not baffled. -
Page 19: Flywheel, Starter, And Fuel Pump Requirements
All LS1-LS9 style engines do not have provisions for a block mounted mechanical fuel pump. An electric fuel pump is recommended for the CT525 engine. A minimum of 110 GPH is required. The pump must be wired using an oil pressure shut off for safety. -
Page 20: Engine Specifications
ENGINE SPECIFICATIONS Type ................. 6.2L Gen IV Small Block V8 Displacement ............... 376 cubic inches Bore x Stroke ..............4.065 inch x 3.62 inch Compression ..............10.7:1 Block ................Cast aluminum, six bolt cross-bolted main caps Cylinder Head .............. Cast aluminum rectangle port Valve Diameter (Intake/Exhaust) ...... -
Page 21: Service Parts List
SERVICE PARTS LIST Part Part Name Name Number Number 12696105 ARM ASM,INTAKE VALVE ROCKER 12573460 PLUG ASM,ENG BLK OIL GALLEY 12681275 ARM ASM,VALVE ROCKER 11588949 PLUG ASM,ENG BLK OIL GALLEY 19242906 BALANCER,CRANKSHAFT 11610259 PLUG,CYL HD CORE HOLE 12623967 BLOCK ASM,ENGINE 11588949 PLUG,ENG BLK COOL DRN HOLE 11588723... -
Page 22: Ct525 Crate Engine
Cast aluminum with 6-bolt, Block (P/N 12673475): The CT525 is based on the LS engine family and is similar to the 6.2L LS3, cross-bolted main caps but we’ve adapted it to circle track racing with a carbureted intake manifold,... - Page 23 Chevrolet Performance Circle Track crate engines. Each is built with brand-new parts and our 350 engines feature blocks with four-bolt mains—a strength-enhancing feature you won’t find on most used blocks. Trust Chevrolet Performance to deliver the durability you need to chase your racing dreams!
- Page 24 ALWAYS USE PROPER TOOLS AND EYE PROTECTION CONTACT YOUR LOCAL GM DEALER FOR MORE INFORMATION DEALERS CAN BE FOUND BY CALLING 1 (800) 468-7387 OR VISITING WWW.CHEVROLETPERFORMANCE.COM P/N 19434343 ©2023 General Motors Co. All rights reserved. Chevy™ GM® GM emblem® Chevrolet Performance™ 0156 1122...
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