Finding a 400 here used to be fairly easy, now there scarce, last time I looked for one I had to go 80 miles to get it. I used to complain because I could trip over 350`s, now you can`t find one. we have 3 drag strips and 1 circle track, so that explains the whole deal. I do not know how true this is, but I`ve read to avoid 4 bolt 400 blocks, there more prone to cracking in the main web area. far as I know they only made the 4 bolt in 70, 71 and 72. but if your not planning on making over 500 horses, 2 bolt blocks are fine.
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