Reply to "2 or four bolts main caps, is it so impotant?"

As George pointed out, if you respect the redline of the engine and if you keep the compression modest, the engine will make even a club racer.

There isn't a lot of point in turning the engine rpm much more then 6,700 or 6,800 rpm in top gear. That is really where the power band shows.

By the same token, the 14 or 15:1 static compression Pro-stock drag racing engines of the day are very impractical also.

The four bolt caps are installed in these engines not for additional clamping of the crank, but to reduce or eliminate the flexing of the caps that happen under hard acceleration and deceleration.

The thrust bearing theoretically does that but as I remember, the clearance on that is set at .012". That's enough to create a vibration on the caps at certain rpm's.

Lots of things aren't necessary. Roll bars, seat belts, shoulder harnesses, etc. I'd rather have them then not.

Oh, the other thing that you want to avoid with the stock block is installing a steel crank vs. the iron crank and you want the biggest, ugliest balancer you can find for it.

Ford built the "Boss Balancer" for a reason. Why question it now?