Can you put a tbi intake on 1999 5.7 r vortec engine and if yes which one?
No, you cannot directly put a TBI (Throttle Body Injection) intake manifold on a 1999 5.7L Vortec engine. The 1999 5.7L Vortec uses sequential port fuel injection (commonly called multi-port fuel injection), a completely different system than TBI. TBI uses a single throttle body that feeds all cylinders through a manifold, while multi-port fuel injection has individual injectors for each cylinder. The engine block, heads, and computer are not compatible with a TBI system. Trying to adapt one would require a massive and impractical amount of custom fabrication.