Andy mentioned partial blockage in exhaust system in earlier post ?

My mufflers , Rhino Turbos many many many years ago , are pretty old but look great from the outside LOL

Sounds damn good

Rebuilt numbers 383 for the last 20 years , never had this issue at higher Rpms

Numbers 383 Was .030 over prior to this Stroker Kit , back then running the old Mopar 284/484 cam and built 906 heads

Flat tops where .025 in the hole until I kissed a piston one day after twenty years

Anyways

Hence this Stroker Kit with same numbers block

Running New Sealed Power stamped steel rockers and shafts with this Stroker Kit

Lifter preload I have written down somewhere

Comp Cams pushrods

Have not changed mechanical fuel pump or Chrome Mopar ECU with this higher Rpms issue
ECU has worked perfect prior for many years