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GM 8.5 10 Bolt Aluminum Main Caps
Includes Bolts - Machining Required

$88.00* Free Shipping (Details Below)

Part Number: H1120

GM 8.5 10 Bolt Housings

Will not fit 68-70 Oldsmobile housings

Replaces thin cast iron main caps
Heavy stress can cause cast iron to flex, crack, & break

Billet aluminum is much more ductile
Increased flexibility make it much less prone to breakage
Thicker material further increases overall strength


2024-T351 Billet Aluminum Caps
– Strong & lightweight
– Easy to machine material
– Clear anodized
– Designed & machined by Strange
– Material made in USA

SHCS Cap Bolts
– Ensures secure cap retention
– 7/16″-14 x 2.250″ to suit casting & cap height

Install caps in housing
Check and record bore sizes
Compare to included chart
Mark each cap with amount to be removed
Mill required material from the feet of each cap
Reinstall and torque to specifications

Related Components

Labor to install caps…………. H1123
Installation kit…………….. R5205 / R5205-SP
LPW aluminum cover…. R5201 / R5203

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Parts List and Installation Guide pdf File


GM 10 blt. alum. main caps with bolts- pr. (requires machining)

Additional information

Weight 1.35 lbs