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Legal and Emissions Information
This publication is intended to provide information about the CT350 circle track engine and related
components. This manual also describes procedures and modifications that may be useful during the
installation of a CT350 circle track engine. It is not intended to replace the comprehensive service manuals
and parts catalogs which cover General Motors engines and components. Rather, it is designed to provide
supplemental information in areas of interest to "do-it-yourself" enthusiasts and mechanics.
This publication pertains to engines and vehicles which are used off the public highways except where
specifically noted otherwise. Federal law restricts the removal of any part of a federally required emission
control system on motor vehicles. Further, many states have enacted laws which prohibit tampering with
or modifying any required emission or noise control system. Vehicles which are not operated on public
highways are generally exempt from most regulations, as are some special interest and pre-emission
vehicles. The reader is strongly urged to check all applicable local and state laws.
Many of the parts described or listed in this manual are merchandised for off-highway application only, and
are tagged with the "Special Parts Notice" reproduced here:
Special Parts Notice
This part has been specifically designed for Off-Highway application only. Since the installation of this part
may either impair your vehicle's emission control performance or be uncertified under current Motor Vehicle
Safety Standards, it should not be installed in a vehicle used on anystreet or highway. Additionally, any
such application could adversely affect the warranty coverage of such an on-street or highway vehicle.
The information contained in this publication is presented without any warranty. All the risk for its use is
entirely assumed by the user. Specific component design, mechanical procedures, and the qualifications
of individual readers are beyond the control of the publisher, and therefore the publisher disclaims all liability
incurred in connection with the use of the information provided in this publication.
Chevrolet, Chevy, the Chevrolet Bow Tie Emblem, General Motors, and GM are all registered trademarks of
the General Motors Corporation.
Package Contents:
Item
1
2
Component Information:
Cylinder Heads:
The CT350 circle track engine has Vortec cast iron cylinder heads. These cylinder heads were first used
on 1996 trucks with port fuel injection, RPO L31. The intake and exhaust ports are very similar to the
Corvette 350 LT1 heads. The heads have 1.94" intake valves and 1.50" exhaust valves with pressed-in 3/
8" rocker arm studs. The water passages are the same as the original 1955 small block Chevy design.
These cylinder heads have an eight (8) bolt intake manifold mounting pattern, four (4) bolts per cylinder
head.
Intake Manifold:
This engine comes with a GM Performance Parts dual plane intake manifold GM Part Number 12366573
designed for use with Vortec cylinder heads. This intake manifold was designed to use a standard flange
Holley carburetor, and does not have provisions for an exhaust gas recirculation (EGR) valve or a hot air
choke.
CT350 Circle Track Engine - 88958602 - Specifications
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.
Description
GM Part Number
Engine Assembly
Specifications
Quantity
88960517
88960547
REV 05FE08
PART NO.
DATE
REVISION
07MY07
Revisions - Rusty Sampsel
05FE08
Revisions - Rusty Sampsel
GENERAL MOTORS
SERVICE PARTS OPERATIONS
6200 Grand Pointe Drive, Grand Blanc, MI 48439
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88960547
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