Bore is stock 81MM as for comp numbers they are as follows, these pistons will fit any 81MM bore B series block
B16A block with B16A head : .....10:5:1
B16A block with B18C1 head :.....10:8:1
B18C1 block with B18C1 head :.. 11:8:1
B18C1 block with B16A head :.... 11:5:1
B18B/A block with B16A head :....11:8:1
B18B/A block with B18C1 head :. 12:0:1
B17 block with b17 head ...........11:0:1
B17 block with B16A head .........11:0:1
B17 block with B18C1 head........ 11:3:1
B18A/B Block with B18A/B head ..11:2:1
All these numbers are with a OEM 3 layer gasket, Some of these numbers will differ if your block/head has been decked/milled, but the figures are damn close to the final comp ratio. all in all the pistons are ment for a killer N/A or nitrous motor..
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Last edited by Blown99civicSi; 11-05-2005 at 06:53 PM.