440 low compression build

Ww58_bandit said

Will go with keith black pistons as can get piston and ring kits.

Would i need step head or flat top to increase cr. Also how to i work out what size compression hight i would need

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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.