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Program Engineering Pontiac 421-428-455 Center Main Caps Billet Steel Main Caps, Splayed Outer Bolts PRO-455C4A-KIT

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PRO-455C4A-KIT

421-428-455 Pontiac Main Caps Splayed Outer Bolts w/Dowel Pins Comes with Bolts and Hardened Washers For outer Splayed Bolt (Set Of 3) by Program Engineering Splayed Main Caps *BLOCK MUST BE ALIGN BORED*

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ARP Main Stud Kit Recommended- Part# ARP-194-5401 or OPT-194-5401

ALL aftermarket billet main caps require line boring and require the thrust surface to be machined to match your particular block

*REQUIRES ARP 2-BOLT MAIN STUDS

***May Require Oil Pan that will accept a External Oil Dipstick. The Stock Tube must be extensively modified to be used.***

Butler Tech Library
Identify Your Pontiac Block Before You Build
Casting numbers tell you what you're starting with, main caps tell you which dipstick setup you have, and the fitment chart tells you what will drop into your car.
Read the Casting Guide ›

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  • 18.0 lbs.

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