ls/vtec b18b ls w/ vtec head and gsr cam gears. I am replacing the head gasket on this since the dumb ass that built it for me did it incorrectly and lied about what he had done to it. My question is what would be the mm bore for the ls block and if the vtec head has the same bore or larger? I also belive that since the cam gears are gsr that i have to go with a gsr timing belt kit. I am an experiance diesel mechanic with 8 years military on track and wheeled vehicals. I have been conducting fuck up repairs no thanks to the ass that was suppost to be a friend helping me since I myself didnt have the time to complete the job. Any help would be greatly appriciated since I am on a time limit of less then a week starting college again on the 28th. Body is a 2000 GS 3door and was swapped from automatic tranny to manual (supposidly GSR) tranny. I trusted this person to do the work and later realized it as Ive conducted repairs personally and noticed all of the imperfections. the pistons are stock which also where suppost to be forged and are not. assumption that lower end engin is stock.