would ctr pistons work in a ls blocc wit a built b16 wit oversized flat top valves im thinking that the pistons will hit the head

 

The pistons: Ls bottom ends have dish style pistons which actually add 3.2 cc to the combustion chamber, and would yield a compression ratio of 9.55:1 with a stock B16 head. This is bad for NA applications because compression is what makes your power. This can be remedied by the reuse of your stock PR3 pistons (the pistons which came from your B16) that push out a total of 6.01 cc from the chamber size (a difference of 9.21 cc) for a compression ratio of 11.33:1 on the same set-up. That is what I would recommend, unless price wasn’t a major concern. That would come out to a total cost of about $50 to have the pistons pressed off and pressed on to the new rods. If cost weren’t as big a concern I’d recommend a set of PCT (Civic Type R pistons) that would displace a total of 8.63 cc, and yield a compression ratio of 12.03:1 (if used in standard .25mm oversize). If oversize pistons were used, you of course would need new pistons which retail in the range of $200-$250. You will also need new piston rings that will cost $140. You will need the block honed over. Any competent machine shop should be able to do this for $80. As well, 1 mm will need to be shaved from each side of the connection rod, to allow the pistons (CTR) to fit. I was charged $55.80 for this procedure.
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