Hey guys i have a spare 16v and 20v motor lying around minus 20v head,and plan on doing a twin carbed conversion with the 16v,however because i have looked at the 16v motor warrant sheet it failed on a few of things for the motor (excessive smoke and whatnot) and my mate being an engine rebuilder would the the 16v head bolt straight up to the 20v block or is there little variations.my mate says if the 16v block has to be used it will cost a lot more as the 20v motor was my sisters and it was the oil rings that let go only.any help with this would be much appreciated thanks.