I believe Big Block mods run steel blocks and are limited to like 460 cubes, so no exactly a direct comparison. Good conversation though. I like BBC's and LS engines too.
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The big blocks that run in the north east are 460 ci steel blocks. They hold together very well if put together right. But thats the same with any engine. I've never heard of any known or repetitive issues. There are guys that are competitive and have won with $10K big blocks but the top guys are in the $30-40K range and they scream. Buddy of mine had one built by engine research out of canada and it clocked in at well over 1,000 hp on the dyno. Some of the builders are Enders, Feil, LJL Kevlar, precision, finger lakes, slaviak and theres a few more that i cannot recall. Some tracks do mix sbc 358's in with the big blocks. On a tacky track, the 358's really dont stand a chance. Fortunately,or unfortunately the tracks up here are mostly dry slick to on occassion you will see a 358 beat a big block in a 30-40 lap feature.