Engine Builds access_timeOctober 29, 2021 mode_comment0 403 Olds Rebuild This 403 Oldsmobile came to the shop for a stock restoration build. An Edelbrock manifold and Brawler carburetor were added for a bit more power. We were able to squeeze 210 HP and 325 TQ. Stock HP was 185 back in the day. Read More admin58