so guys i have a b18a block and its lost compression already. i need to rebuild pretty soon.i also have a b16 motor laying around ;the block in gud condition and the head no so quite. so my question is will the b16 pistons fit in my b18 block? and if it does what piston rings should i use? dis has been bothering me for a while now cuz i noe that b16 and b18 dont have the same bore size. so if anyone can help me out please do so and for the ones to tell me go search..i already did and ppl end up bein asses in the post ive read so please help and thanks in advance

 

yes the PR3/P30 pistons will fit on LS rods. with PR3 pistons and a stock gasket with an LS longblock you're looking at about 10.8:1 compression, with the P30's..11.0:1.

B16 and B18 have the same bore size... 81mm. only the B20 has an 84mm bore.

Use the piston rings for whatever piston you use.

 

right on mang