whats the best bore for stock sleeves on a b18a1 to use 12.5:1 pistons? can i use the b18a1 head? and last can i use 93 octane? thank you

 

best bore? stock, 81mm. yes you can ise the stock head.

 

yea but i cant fine 81mm 12.5 cr pistons anywhere
aslo with this eagle h-beams
all arp bolts head and mains
block girdle and block gaurd
crower 405s and valve-train kit
skunk2 intake manifold
fuel rail !!!!!!!!!!!!!!!!! what injectors should i get??????
and msd ignition

how much hp and trq do you think i will put out

 

CTR's will give you 12.4:1 CR, but you may have trouble putting them on Eagle Rods. It can be done though. Just search to find your answer.

Also 81mm or 81.25mm is your best bet.