FAYLUR since you have so many 283 parts how about sharing just one little block that can be bored to 0.40 and i will swap you one that can be bored to .100 over you can,t pass a deal like that cause you said you wanted to see how far it would go before snap and pop just for the record there was a guy here that was boring them that much but i just need one for my 65 chevy truck i have the parts to build one .40 but the block i have the machine shop messed up and it would have to go .60 or .80 think about a swap and then rev till it goes