Inliners International Forums General Discussion Engines What are the differences between truck and car 235

55 was last year for distinction. The standard shift blocks were not drilled for the hydraulic lifters. Top oiling was from the back cam bearing via a steel tube behind the side cover for late 54 (the early production 55 blocks) through 58 (not sure about 53-54 production power glides as I have never messed with them, they may have the same rocker oiling method). In 59, the oiling system was altered again to provide a direct passage from the main oil galley up to the head eliminating the steel tube behind the side cover. The orifice in the head feeding the rockers was also enlarged, the rocker connector was pinched off (more pressure and volume) and the groove inside each of the rockers was offset (no longer intersecting the dribble hole like on the 55-58 rockers) to make use of the higher volume and pressure without the higher pressure and volume spitting beyond the rockers and valve springs.

I don't know if you should avoid a truck block. One reason to use mechanical lifters is the problem that seems to plague the new manufactured hydraulic lifters, some of them have a nasty habit of collapsing shorty after break in. for Hydraulics, you want to find some nos GM or rnos aftermarket that are 25 years old or older. Otherwise, have the cam reground for mechanical lifters there is no issue with the new manufactured mechanical lifters. BTW, the mechanical cam does not need nearly as much in the way of valve adjustments as you might hear. Once set, they stay pretty good and only need a periodic adjustment.