GM 12 Bolt Car Aluminum Main Caps Includes Bolts - Machining Required


Part Number: H1121

GM 12 Bolt Passenger Car Housings

Will not fit truck 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 2.50″ 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
Installation kit…………………… R5211
Chrome cover…………………… R5199
LPW aluminum cover…. R5206 / R5207


GM 12 blt. alum. main caps with bolts- pr. (requires machining)

Parts List and Installation Guide pdf File