using the compression calculator and 78cc for TF240 heads putting the other parameters in>4.350 borex3.75, .039 h/gskt etc.>
KB pistons would yield 10.86:1CR with 0 deck
Spreed Pro would be 10.66:1 with 0 deck
depends on your block deck height etc.
not an expert on this, perhaps others here can chime in if I've got it wrong.
