Complex sentence: The forged connecting rods were shot-peened and magnafluxed for strength with stronger bolts/nuts, and forged domed pistons gave an 11.3:1 nominal (11.1:1 advertised) compression ratio.
Split into simpler sentences: The forged connecting rods were shot-peened and magnafluxed for strength, and used stronger bolts/nuts. Forged domed pistons gave a 11.3:1 nominal (11.1:1 advertised) compression ratio.