SSCamaro99_3

iTrader: (1)

Those bumps are almost gauranteed to be Injectors as the spray path is directly into the chamber (most likely forced a move to perimeter bolts), 3 valves is covered above.

5.3 and 6.2 is the consensus for these. The econonic and fuel/power reasons have been covered in here before. 5.5 is racing only as it is a class requirement. The Magazines jump on it to fill print space.

firebird99

iTrader: (2)

Ok so how far can the DI pump and injectors be pushed past stock once people start modding them? On the norm does compression in a DI engines rise to the point of not being able to safely add boost?

LS1LT1

iTrader: (16)

True, the available increase in compression ratio that DI permits is likely the main contributor there.