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Not knowing whether you've performed the mods to the car, or purchased it that way?....but any chance the MSD may have a 5000 RPM rev chip limiter?



Oh yea try different chips if it as a limiter.


The other thing that can cause that is too much preload on the lifters and it pumping open. you can try taking a 1/2 turn at a time out of adjusters to see what it does don't be afraid of a little ticking!


Are the heads milled and or block decked much?