Need a bigger line wrench than whats in my toolbox, whats the wrench size? Doing the intake manifold gasket, cant get that nut to budge, tried a big crecent wrench, just wants to round the nut off. Seems like it could be. 22 mm. My 7/8 end wrench isnt a very tight fit, my largest line wrench is a 21mm. I did this gasket 6 months ago on another blazer with no issues, but looks like i need another tool for this job..