[markjohnson]

The '71 LS-6 Corvettes are something I was also gonna bring up. I'm pretty sure Tonawanda just slapped the 118cc Open Chamber Aluminum heads onto a standard 11.00-1 closed chamber piston motor. This is gonna knock the compression ratio down to 9 or 10.00-1. I'm also pretty sure that the Crate LS-6 's that were produced for several decades as 10.2-1 Compression engines were done so by putting Cast Iron Open Chamber heads onto a closed-chamber piston short block.