that's a good 283 block number from 65-67 either truck or car .... those years shouldn't be bored more than .060, thinner walls than the mid-range ones

to get closer than that you'd need the number off the boss in front of the pass side head

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics