helo i just found a picture from when i took my head off last year ,now i could see that the pistons had been machined for low comp but how much differnce would that make in comp-ratio and from the picture wich isnt that good could any one tell me if they think the pistons are 2wd or 4x4 , and would any of you like to have a guess on the compression ? was built with a head measureing 168.8 and a group a headgasket thanks garry