Found in my shop sbc 305, when I checked rod length it was 5.565 instead of 5.700 as listed in manual. Casting number on the block is 14010203 - 80-85' 305 cid 2 bolts.
Is it trick with big block rods and specific pistons (for what?) or should I get stock 5.700 rods, bore block and install stock pistons and forgot about this strange short rods?

Never saw this setup before...Really cant fugure history of this engine.