Originally Posted by
AngelesRunner
Your 87 engine was a tall block 2.5 and a 91 2.5 was a common block. Tall block was taller by the increase in the stroke necessary to change a 2.2 into a 2.5. The 2.2 revs better and is more desirable for a turbo car. The rod angle on the 2.5 is too great and a real limit to longevity in the 2.5. You get very early rod knock in these motors. The best drag motor is a 2.2 crank in an 86 to 88 tall block with custom rods and pistons but this (expensive) only gets you into Chevy territory for (rod length)/Stroke ratio.