The rules are open on the motors with the exception of no turbo's or blowers.

I will be running with/against 350 chevy's on an opened wheel car weighing about 1600 lbs.

It would be nice to make it work with 4.2. I might be able to offset the lower torque with some advantages the 4.2 has in other areas:

1. The ability to run higher compression. some say 16 to 1

2. The weight savings 100lbs?. better acceleration, braking and handling

3. Upper midrange and high end power (I just found out my upper range will be closer to 6300 not 5300)

Does anybody know how far over the 4.2 can be bored? I would like to squeeze at least 280 cubic inches out of it.

Steve