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OBS Enthusiast
So swapped in a Blueprint Engines aluminum head 383 in my '97. Used a new Delphi intake and used the Delphi MPI "spider". Used JBA header and new Magnaflow convertors. The engine had a terrible lifter type "tick". Pulled valve covers their "self aligning" stamped rockers were able to pop side to side and you could hear a big click just doing it by hand! They sent me GM rocker but still too much side especially since there are no guideplates and no slots in head like the iron heads have. Got some Harland Sharps and they have a nice tight self aligning roller. Lifters did not really bleed down when resetting lash so they seemed good. Improved the noise considerably. But there is still a slight "clicking". it can totally go away usually when coasting no throttle, and con not hear WOT. But slow throttle increases with rpm. It does sound like an LS motor injector click, not really "header sounds". Neither me nor my mechanic buddy can pinpoint it. Motor runs smooth no misses.
He has never put the MPI injectors in a Vortec so not sure if that is it. Any ideas?
FWIW the welds on the Chinese OBX SS headers were nicer than the US JBAs! But their port was huge and no EGR connection.
He has never put the MPI injectors in a Vortec so not sure if that is it. Any ideas?
FWIW the welds on the Chinese OBX SS headers were nicer than the US JBAs! But their port was huge and no EGR connection.