My 235 is from a ‘59 passenger car, 135HP and is really peppy. Your ‘58 has 145HP so it should be even better. Even your good cylinders are really low at 76 lbs. According to a 1961 Motors Truck manual, a compression ratio of 8:1 should have a compression of 140 lbs. Your engine, if it truly is a ‘58 235 has a ratio of 8.25:1. Rebuild it and I believe you’ll be fine.
Last edited by Phak1; 07/03/20251:14 AM. Reason: Typo
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
