Originally Posted by RPM
That and degreeing in the cam to a better spec. A few degrees cam timing change will make a big difference. And he is not telling everything he did.
There are a lot of small tricks. Like Ron said, degreeing the cam. You can advance the cam and increase cylinder pressure. Retarding the cam will reduce the power off the line but make it run harder on the top end.
There are literally hundreds of "tricks" some good, some bad. The tricl is to know what one you let them do to yours