ACL RACE SERIES PERFORMANCE MAIN & CONROD BEARINGS SET -0.020" UNDERSIZE [HOLDEN 6-CYL 138-149-161-173-179-186 RED MOTOR]

ACL RACE SERIES PERFORMANCE MAIN & CONROD BEARING SET
-0.020" UNDERSIZE
HOLDEN 6-CYL 138-149-161-173-179-186 RED MOTOR

08/1963-1974 HOLDEN [EH-HD-HR-HK-HT-HG-HQ SERIES]
10/1969-1974 HOLDEN [LC-LJ TORANA]

High performance driving demands that you use the best parts. So rely on ACL's Race Series Products to perform to the exacting durability standards you expect. They provide the dependability it takes to hold up under higher RPM conditions.

The unique combination of design, metallurgy and engineering comes together to deliver what drivers expect from high performance parts. ACL Race Series Engine Bearings are a must for your performance engine.

FEATURES:

• High strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing
• Increased crush for improved bearing retention
• Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing
• Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films
• 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings
• Tight consistent wall tolerances to help you maintain consistent clearances
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts

MAIN BEARING SPECIFICATIONS:

POSITION 1,2,3,4,5,6
Standard Shaft Diameter: 2.1978"/2.1988" (55.824mm/55.849mm)
Maximum Wall: 0.0954" (2.423mm)
Housing Bore: 2.3906"/2.3916" (60.721mm/60.747mm)
Max Length: 0.8070" (20.490mm)

POSITION 7 (REAR with THRUST)
Standard Shaft Diameter: 2.1978"/2.1988" (55.824mm/55.850mm)
Maximum Wall: 0.0954" (2.423mm)
Housing Bore: 2.3906"/2.3916" (60.721mm/60.747mm)
Max Length 1.0090" (25.630mm)

Material: RACE SERIES (TRI-METAL)

CONROD BEARING SPECIFICATIONS:
Min Standard Shaft Size: 1.8990" / 48.235mm
Max Standard Shaft Size: 1.9000" / 48.26mm
Min Standard Tunnel Size: 2.0247" / 51.427mm
Max Standard Tunnel Size: 2.0252" / 51.44mm
Max Wall At Crown: 0.0619" / 1.572mm
Max Overall Length: 0.7220" / 18.34mm
Wall Size Tolerance: 0.0003" / 0.0008mm
Material: F781 (TRI-METAL)
Series: ACL RACE

The Main Bearing Sets are manufactured in Tasmania (Australia) by Leaders in Bearing technologies ACL Bearing Company. ACL is Australia's sole manufacturer of precision engine bearings and was a Original Equipment Manufacturer to Holden.

REPLACES HOLDEN PART# 7430407 & 7429120

SPECIAL NOTE:
CRANKSHAFT & CONNECTING ROD JOURNAL IS MACHINED -0.020" UNDERSIZE

MADE IN AUSTRALIA