I have recently aquired an 89 XP 200, the motor is stock and cranks 90psi one side and 95psi on the other. I like everyone want to squeeze a little more from it. The questions are...
-How much more compression can I increase and stay in 89 oct. fuel
-What was the factory purpose for the intake cover liner (noise, tunning) what is the effect of its removal
-What were the basic 'clean up' procedures for reliable increases.
-What does the power curve look like after 6000rpm, does it really fall off that fast.
What did the factory do to make 250 HP on pump gas with basically the block.
Thank for any enlightenment.