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Thank you for choosing Chevrolet Performance as your high performance source. Chevrolet Performance is committed to providing proven, innovative
performance technology that is truly.... more than just power. Chevrolet Performance parts are engineered, developed and tested to exceed your expectations
for fit and function. Please refer to our catalog for the Chevrolet Performance Authorized Center nearest you or visit our website at
www.chevroletperformance.com.
This publication provides general information on components and procedures which may be useful when installing or servicing a 350/265 HP engine. Please read
this entire publication before starting work. Also, please verify that all of the components listed in the Package Contents section below were shipped in the kit.
The information below is divided into the following sections: package contents, component information, 350/265 HP engine specifications, additional parts that
you may need to purchase, torque specifications, and a service parts list.
The 350/265 HP engine incorporates modern technology in a package that can be installed in most applications where 265-400ci small block Chevrolet V-8s were
originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a 350/265 HP
engine can be installed, some procedures and recommendations may not apply to specific applications.
The 350/265 HP engine is internally balanced and requires no balance weights on either the flywheel/flexplate or the harmonic balancer. A non-Vortech design
intake manifold must also be used. When using the 350/265 HP engine as a replacement for an original equipment engine, the performance intent of this engine
should be considered. The torque curve is higher and consequently may require a torque converter with a higher stall speed on automatic transmission equipped
vehicles. Consult with a reputable torque converter manufacturer for assistance in selecting the correct torque converter for your application.
The 350/265 HP engine is manufactured on current production tooling; consequently, you may encounter dissimilarities between the 350/265 HP engine assembly
and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a 350/265
HP when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences
between a 350/265 HP engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the
350/265 HP engine. When installing a 350/265 HP engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate
various components for the cooling, fuel, electrical, and exhaust systems.
It is not the intent of these specifications to replace the comprehensive and detailed service practices explained in the Chevrolet service manuals.
For information about warranty coverage, please contact your local Chevrolet Performance dealer.
Observe all safety precautions and warnings in the service manuals when installing a 350/265 HP engine in any vehicle. Wear eye protection and appropriate
protective clothing. When working under or around the vehicle support it securely with jack stands. Use only the proper tools. Exercise extreme caution when
working with flammable, corrosive, and hazardous liquids and materials. Some procedures require special equipment and skills. If you do not have the
appropriate training, expertise, and tools to perform any part of this conversion safely, this work should be done by a professional.
Legal and Emissions Information
This publication is intended to provide information about the 350/265 HP engine and related components. This manual also describes procedures and
modifications that may be useful during the installation of a 350/265 HP engine. It is not intended to replace the comprehensive service manuals and parts
catalogs which cover Chevrolet 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 any street or highway.
Additionally, any such application could adversely affect the warranty coverage of such an on-street or highway vehicle.
Chevrolet, Chevy, the Chevrolet Bow Tie Emblem, General Motors, and Chevrolet are all registered trademarks of the General Motors Company.
350/265 HP Engine Long Block Specifications
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
04OC17
UNITIZED IN ACCORDANCE WITH
17JN20
GMCCA SPECIFICATIONS.
350/265 HP Engine Long Block Specifications
I-Sheet Part Number 19420527
REV 17JN20
Revision
Auth
Previous Revisions are
Archived
Revision Rusty Sampsel
N/A
Revision Alin Dragoiu
N/A
PART No.
19240527
DR
Installation Instructions
Title
350/265 HP Engine Long Block Specifications
19240527
PART No.
SHEET
1 of 22
SHEET 1 of 22

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  • Page 1 Chevrolet Performance parts are engineered, developed and tested to exceed your expectations for fit and function. Please refer to our catalog for the Chevrolet Performance Authorized Center nearest you or visit our website at www.chevroletperformance.com.
  • Page 2 Item Description Quantity Part Number Engine Assembly 12681429 Long Block Instructions 19420527 350/265 HP Engine Torque Specifications: Bolt/screw, camshaft sprocket………………………………………………………. 18 ft-lbs./25 Nm Nut, connecting rod……………………………………………………………………….. 006” bolt stretch preferred 20 ft-lbs. + additional 55° …………………………………………………………………………. (45 ft-lbs. if no angle gauge is available) 27 Nm + ………………………………………………………………………….
  • Page 3 Start-up and Break-in Procedures: After installing the engine, ensure the crankcase has been filled with 10w30 motor oil (non-synthetic) to the recommended oil fill level on the dipstick. Also check and fill as required any other necessary fluids such as coolant, power steering fluid, etc. The engine should be primed with an engine priming tool that is not included with the engine.
  • Page 4 Oil Pan…………………………………………………………………………………… 4-quart Oil Pressure (Normal)…………………………………………………………….. 20 psi ! 2000 RPM Recommended Oil…………………………………………………………………. 10w30 synthetic motor oil (after break in) Oil Filter…………………………………………………………………………………. AC Delco part # PF454 or PF1218 Valve Lash……………………………………………………………………………… 1/8 turn down from zero lash Fuel……………………………………………………………………………………….. Regular unleaded – 87 (R+M/2) Maximum Engine Speed…………………………………………………………...
  • Page 5 Always check for adequate hood clearance when installing a new air cleaner. Chevrolet Performance has two chrome 14" air cleaner assemblies for single 4 barrel engines. 12342071 is the classic design and 12342080 is the high performance design.
  • Page 6 350/265 HP Service Parts List Part # Name Part # Name 12453170 Bearing, Cm/Shf #1 12523924 Bearing. Conn Rod (Std) 12453171 Bearing, CM/Shf #1 and #5 10066039 Pan Asm, Oil 12453172 Bearing, CM/Shf #3 and #4 14082340 Reinforcement, Oil Pan 3877669 Bolt/Screw, Cr/Shf Brg C 10066041...
  • Page 7 Nous vous remercions d'avoir choisi Chevrolet Performance comme source de haute performance. Chevrolet Performance s'est engagée à offrir une technologie de rendement éprouvée et novatrice qui est réellement..beaucoup plus que de la puissance. Les pièces de Chevrolet Performance ont été conçues, élaborées et mises à...
  • Page 8 Description Quantité Numéro de pièce Ensemble moteur 12681429 Instructions pour bloc long 19420527 Caractéristiques du couple moteur du 350/265 HP Boulon/vis, pignon d’arbre à cames 18 lb pi / 25 Nm ......................Écrou, bielle Allongement de boulon de 006 po recommandé 20 pieds-livres + 55°...
  • Page 9 Le moteur 350/265 HP a des culasses en fonte. Les culasses ont des soupapes d'admission de 1,94 po et des soupapes d'échappement de 1,50 po avec des goujons noyés de 3/8 po et des chambres de combustion de 76 cc. Les passages d'eau sont les mêmes que ceux de la Chevy à bloc compact originale de 1955. Ces culasses sont montées avec une tubulure d'admission à...
  • Page 10 12. Vidanger l'huile et remplacer le filtre. Vérifier l'huile et le filtre à huile de nouveau afin de repérer toute particule étrangère pour s'assurer que le moteur fonctionne correctement. 13. Ne pas utiliser d'huile synthétique pour le rodage. Il est conseillé d'utiliser de l'huile moteur synthétique après la deuxième vidange d'huile et le kilométrage recommandé.
  • Page 11 capot du HEI peut gêner les autres composants sous le capot dans des véhicules non équipés à l'origine de systèmes d'allumage HEI. Vérifier le bon espacement avant la pose. Le système HEI nécessite une alimentation électrique en 12 V pour fonctionner correctement. Le système d'allumage HEI doit être directement raccordé à...
  • Page 12 La distribution du mélange de carburant peut être dérangée si aucun diffuseur n'est utilisé, ce qui entraîne une mauvaise puissance et des ratés à régime moteur élevé. Toujours assurer un bon dégagement du capot à la pose d'un nouveau filtre à air. Chevrolet Performance dispose de deux ensembles de filtre à...
  • Page 13 Pour monter le moteur sur un véhicule équipé à l'origine d'un V-8 petit bloc avec allumage HEI, il est possible d'utiliser des fils de bougies standard de rechange. Des jeux de fils de 8 mm de diamètre à hautes performances avec le logo Chevrolet en nœud papillon sont disponibles chez Chevrolet Performance pour des montages personnalisés.
  • Page 14 10121044 Ens. joints, huile vilebrequin Ar 93438953 Ensemble couvercle, Culbuteur de soupape 106751 Clavette-amortisseur de vibrations 93438952 Ensemble couvercle, de torsion Culbuteur de soupape 10108688 Ensemble bielle 3877670 Renfort, Culbuteur de soupape 461372 Boulon/vis, Bielle 3933964 Joint d'étanchéité, Couvercle de culbuteur de soupape 3866766 Écrou, Bielle 10066063...
  • Page 15 Las partes de Chevrolet Performance están diseñadas, desarrolladas y probadas para exceder sus expectativas de ajuste y función. Por favor consulte nuestro catálogo respecto al Centro Autorizado de Chevrolet Performance más cercano a usted o visite nuestra página en Internet www.chevroletperformance.com.
  • Page 16 Descripción Cantidad Número de parte Conjunto del motor 12681429 Instrucciones de bloque largo 19420527 Especificaciones de par de motor 350/265 HP: Perno/tornillo, rueda dentada de árbol de levas 18 pies-lb. / 25 Nm ......................Tuerca, biela Perno alargado .006" preferido 20 pies-lb. + 55° adicionales ......................
  • Page 17 Culatas de cilindro: El motor 350/265 HP tiene culatas de cilindro de hierro fundido. Las culatas tienen válvulas de admisión de 1.94" y válvulas de escape de 1.50" con pernos de 3/8" a presión y cámaras de combustión de 76 cc. Los pasajes de agua son los mismos que el diseño original de Chevy de bloque pequeño de 1955. Estas culatas de cilindro tienen un patrón de montaje de múltiple de admisión de doce (12) pernos, seis (6) pernos por culata de cilindro.
  • Page 18 11. Conduzca las siguientes 500 millas bajo condiciones normales o 12 a 15 horas. No opere el motor a su capacidad de velocidad máxima. De igual manera, no exponga el motor a periodos largos de carga pesada. 12. Cambie el aceite y el filtro. Nuevamente, revise si el aceite y filtro de aceite tienen partículas extrañas para asegurar que el motor funcione correctamente. 13.
  • Page 19 tapa de diámetro grande de HEI puede interferir con otros componentes debajo del cofre en vehículos no equipados originalmente con sistemas de ignición HEI. Revise el espacio adecuado antes de la instalación. El sistema HEI requiere un suministro de energía de 12 voltios para operación adecuada. El sistema de ignición HEI se debe conectar directamente a la batería con alambre calibre 10 o 12 a través de un interruptor de ignición de alta calidad.
  • Page 20 Se recomienda un carburador de cuatro barriles Holley de 670 cfm ya sea con secundarios mecánicos u operados por vacío y estrangulador eléctrico para el motor 350/265 HP. Chevrolet Performance tiene disponible un carburador de cuatro barriles Holley de 670 cfm No. de parte 19170092 con secundarios de vacío.
  • Page 21 Cuando se instale el motor en un vehículo equipado originalmente con un bloque V-8 pequeño con ignición HEI, se pueden usar cables de bujía de reemplazo estándar. Los juegos de cable de 8mm de diámetro de alto desempeño con el logotipo de Corbatín Chevrolet están disponibles a partir de Chevrolet Performance para instalaciones personalizadas.
  • Page 22 10105117 Empaque, culata de cilindro 9424877 Perno/Tornillo, rueda dentada de árbol de levas 10168525 Perno/Tornillo, culata de cilindro 14095256 Ensamble de biela, (largo) empuje de válvula 10168526 Perno/Tornillo, culata de cilindro 5234200 Ensamble de elevador, (medio) válvula 10168527 Perno/Tornillo, culata de cilindro 12557390 Tuerca, (corto)