Hello I've built a new engine 408 cid , After three days of running the engine went to test the engine here, where the shock is that the engine does not go over 5000 RPM with WOT.
i will change the Valve Spring and all the electronic parts ( cam Sensor , crank sensor , map , maf , ecm ) , fuel pump pressure 58 psi AFR 12.8 .




i need
Advice

 

Does it idle and run fine to 5K?

 

my TB was only opening 82% last time on the dyno. Looked like it dropped a cylinder after 5K and the tuner quickly let off. Adjusted the cable and it was good to go. Doubt this is your problem, but something to look at.

 

You don't have any friends that would have changed your tune and set a 5K rev limiter do you?

 

about idle its ok

i will chack in the dyno TB opening 100%

same Problem 5000rpm not the highest

 

did your tuner lock the tune to 5000 for you to break it in?
ive heard of people doing that to insure themselves a little with warranty on a motor they just sold and tuned to avoid it coming back broke the next day.
but... i would think he might have told you about it, lol.