HI Tony thanks for the reply,unfortunately i already bought the new turbo,the l20et that i have came with a stupid modified turbo that has a huge ar1 turbine housing,so i scarpped that turbo,i have a l28 engine(F54 block with N42 Head) the problem is that this l28 is a centre bowl sump and skyline uses a front bowl,now my idea is to put the sump and oil pickup from the l20et engine onto the l28 and get the engineers to drill the block for the oil dipstick,im not too sure as to what you mean by The engine cores,is it the spacing between the cylinder bores ?
I would love to have a l28et cos of the extra power its able to make compared to the l20et.