Is the ford v8 427 a big block?

If your talking about a ford fe 427, made from 1963 to 1968, yes it is a ford fe big block. Fe engines were made from 1958 to 1976. These engines should not be confused with later 385 series big blocks sold as 370, 429 and 460 cid. Fe engines came as 332, 352, 390, 406, 410, 427 and 428 cid for automobles and 359, 360, 361, 389 and 391 cid for medium and heavy duty trucks. As of late many people have been making 427 cubic inch stroker 351 windsor engines, which of course are not big blocks.