I got some ported corvette alloy heads for my car, it has been balanced new pistons/rings etc, ported penlum, eldelbrock runners cut in 2" at top, cold air mafless tune and new headers exaust, AFPR, 224,218 cam

Questions are ... 1. do I need more injector than std 350?
2. do I need larger TB?
3. Should i get a bigger manifold

I want about 400hp fly

 

A stock 48mm TB can support 505HP, as proven by GM on various crate engines.

A larger intake base will help flow, but a different intake altogether would help even more.

22# injectors should work fine with that combination if the programming was done to support it. The VE tables are likey going to change with the intake tract alterations.

 

Thanks Vader,
thought the tb would be ok.
Might get the tpis big mouth then. might be easier than porting the std one.
The tune will be done when its all finished