Do the engine "through bolts" vary from year to year. For instance, will the engine "through bolts" on a '71 911T fit on a 2.4 case that has been converted to 2.7 specs? Or will 1966 "through bolts" fit in a 1977 2.7 or even a "78 SC 3.0. Where are the cut off years and varients. I'd appreciate the info. Thanks, R
