1000 rpm loss after carb & ign. repair

[ZooKypr]

273 Commando engine - Holley 600 double pumper - HiPo cam, Edelbrock RPM intake - dual exhaust - port n polished heads
Last year I rebuilt the front end of my carb in order to cure the engine stumbling/hesitation at WOT between 2000-3000 rpms. (relaced gaskets, pwoer valve, float & needle....Anyway I use to shift her @ 6500rpms with this issue an after I cured the hesitation I now can only shift @ 5500rpm but she pulls hard @ WOT all the way through the power band. I also went from a Mopar Hi-Po distributor to a stock distributor because of a misdiagnosis of a fuel delivery issue. Did I lose the 1000rpms from 6500rpms because I corrected the 1000rpm hesitation @ 2000rpm & 3000rpm? Or did the stock distributor cause the 1000rpm loss from 6500rpm to 5500rpm?

Thx

ZooKypr

 

[dodge freak]

Maybe your valve springs are just getting old?

 

[rumblefish360]

I'd say yes. You can recurve the distributor ike the performance one or just swap back if possible.

 

[moper]

Make one change at a time and find out. I'd say yeah, the ignition curve is the issue.

 

[ZooKypr]

Well....over a phone call talking with my buddy I described the problem and he said it sounded like I was "starving for fuel" in my high rpm range". He told me to change the fuel filter. So I put a new one in and I regained my loss rpm & power. I revved her out to 6000rpms about 6-7 times, no issues. Prior to this my max rpms dipped to 5200rpms. Picked up 800 rpm from a clogged fuel filter! I made an error in my earlier post....my max. rpm was not 6500rpm, well it was when I had a "bad flat spot" between 2000 - 3000 rpm from a bad power valve.
All seems fine for now...keep ya posted if things revert back.

Zookypr