LesteR723

motor specs:
-408w with 4340 forged flattop pistons/crank/rods & ARP hardware
-Canfield 195's
-Custom Grind street/strip cam
-TF intake manifold

what size TB and injectors do i need?

dman302

ummm....carb would be you're only real option unless you're running an aftermarket FI system...then you'd likely have the ask the FI supplier.

88BlueGT

HUH? Why is carb his only "real" option ??????? There are many guys who run EFI 408W's

dman302

I'm sure you would need to use an aftermarket FI system..I may be incorrect but in assuming he's using aftermarket then as stated I would inquire with the supplier as to components that would best suit your needs....standard mustang parts just won't apply to the 351.

w8less

dude if you have the knowledge to build a freaking 408 with good heads and a custom grind you should be able to have a good idea where to start.

what do you think this motor will need?

FullAuto

Depends on the intake and how aggressive the overall combo is. I'd probably run a 75-90mm.

grumpyphillips

I would think at a bare minimum you would need an 80mm TB and 30lb injectors.

AdderMk2

30# injectors would be a bit small... i'd start at 36#

LesteR723

okay thank you to those who are helpful

and screw all of you who just sit on forums to criticise people who use forums for their intended purpose, getting help.

FullAuto

If you use someone like Jay Allen for just a hyd. roller cam, even on pump gas, I don't think it will be too difficult to get 450+rwhp out of this combo. I'd probably go right for a 42lb injector N/A.

In fact, some people are going to flip out when I use a 42lb injector on my N/A 10.5:1 347.