Looking at a 427 SBC fresh off the dyno and arrived at my door. Good numbers, 528 H/P 580 TQ. Unpacking and found they had installed an 18 to 20 lb flywheel instead of a flexplate? The old SBC had a flexplate, so I'm thinking that I might need to talk to the builder.
But before I do that, for jet boat engine performance, I thought that the lighter weight of the flexplate compaired the a higher weight of a flywheel was the way to go. Looking for input.