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It's kinda both SFI and TBI....there's one central injector that runs to individual poppet valves. If that's been replaced as well as everything else I would suggest taking it to a GM dealership and have them check the timing with a Tech II scanner. The phasing with the camshaft position sensor can only be set with a Tech II, a timing light will not work on these engines.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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