Anybody have an opinion on using a 71 clevland block to build a 408 stroker motor? Has anybody used a cleveland block for a stroker engine and been trouble free? I have a 71 stock block on a 4.00in bore. I believe also I've read in this forum about filling the block part way with block hardener. Has anybody done this in a street application? I really cant have any overheating problems as I'll be using aluminium heads. Maybe I should concider 393 instead? Any feedback is appreciated.