[shommel]

i understand the difference between A(225 hrs pwr) and K(271 hrs pwr solid lifter) code motor ,but since they are both high performance motors why is the A code rally pac only 6 grand while the K is 8 grand?is it not possible for the A code to rev up to 8 without blowing?

[Veronica]

Hello. If you run the 'A' code motor up to 8K on a regular basis, yes, it will blow up, as would most motors of that era. That's what all of the differences in a K code and an A code were designed to prevent. Beefier main bearing caps, different head design, etc... All intended to keep the motor from flying apart.

[shommel]

veronica you are the greatest. is there anyway besides changing to solid lifters to beef an A code up to K code specs so it can handle the heavy revving?

[Veronica]

Hi again. You are too kind. If you put a pair of K code heads on the motor, drilled and tapped the block for the larger main cap bolts, used a set of K code main bearing caps, or ( much cheaper ) a set of the mexican caps, got the beefier connecting rods, bigger balancer, etc... You would have a K code motor, it just wouldn't be an original K code motor. The K codes and A codes used the same block, intake manifold, and crank shaft. The cranks for the K codes were tested for hardness, and if the passed, they went in a K code, if not, they went to an A code, or C code or something. A lot of that K code stuff isn't cheap, but, yes, you can bring an A code motor up to K code specs.