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Sourced a B21FT to put Ghetto back together, what is compression ratio with 530 Head?

Yep. 7.5.

531 and 405 are the bigger ones and will m ake it more like 7.3.

It'll be 7.5 with a 160,398, or 530.
 
the only thing that could bring it lower than 7.5:1 is those b230k pistons which would make it like 5:1 or something reminiscent of 1920's.
 
Good news man. My one day off this week is tomorrow I'll come over and lend a hand.

(Can I borrow your body hammer for a little bit ^_^ )

I can help with tuning on Thursday evening as well (get off work at 4). I think we can play a little with your req fuel to get us in the ball park fuel wise, and then bump a few degrees in the load parts of your ign map.

Few long mid throttle runs up fountain grove and we'll have enough data to dial in the map for the most part.
 
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