well, if that's all right i stand corrected. again my question really is that if what i have turns out to be a 400 with 455 heads would that have been a simple "bolt on" change? i know the 455 and 428 have bigger journals than the 400. what about bolt patterns, water channels etc. then what about moving parts? again, i understand that the casting numbers will let me know what exactly is there. for now, i'm just trying to look ahead if it turns out to be a mess and i can't really find very much by doing general searches. if i were checking on differences between windsor blocks there would be a ton of information out there. i thought going into gm stuff would be simple since the sbc is so popular.
