Very nice! I have been waiting for this. Quite honestly, some other people's numbers on IA are a little off...

P72 head/B18A/B Block

STD = 13.170743903246784

--compared to--

4) B18A/B Block with B18C1 (P72) head

PR4 (B18A/B) pistons: 9.73:1

PR3 pistons: 11.59:1

P30 pistons: 11.81:1

PCT pistons: 12.27:1

I know some people who have run this setup on pomp gas for years, and 13.17:1 just isn't possible with 93. 12.27:1 sounds MUCH more accurate.