I am building a 408 with 10.7:1 CR, DART heads, 237/242 .595 .595 112 lsa, and will be spinning it as high it will go and still perform. I will be spraying a 200 shot on it also but it will be a wet system so I dont need to make up for the fuel through the injectors. Im thinking Im goign to need to and if I do what size would sufficient?

 

Start with 60's

CD

 

60#ers are a little over kill Im thinking 8.1L marine injectors.

 

408 is a tad bigger than a 6.0 is. 42's on a 6.0 with a Radix is kinda pushing it. 408 with juice, that cam and heads is gonna demand a good bit of fuel. Better to get some fat injectors than max out the 42's on a juice run and pop your motor eh!!

Also time for a good fuel pump if you dont have one!

 

Whatever you do when you are juicin, dont run lean. I would go with the 60#ers rather than fry a $5000+ motor due to a little thing like injectors. i would say you are cutting it close with 42#ers. JMO I know your gas is gonna suck as well but hell, if you are a badass with a 408 stroker, whos counting mpg (besides your wallet)

 

Oh yeah...when in doubt, call Allen! He is the truck god you know.

 

Yes Im sure Allen can tell me. I dont really think I need 60# injectors since the nitrous system is a direct port wet system so all the injectors are going to be for is fuel for the engine. I owuld think this thing is going to move more air than a blown 6L would and they use 43# injectors all day long. Although later on down the road it may be blown.

 

The 42lb, shortie injectors a stock Radix uses are a direct replacement and will give you enough capacity for your sprayed 408.You don't need 60s.

 

Anybody have a recommendation of where to pick a set up?

 

dude you didnt say direct port! I thought it was just the little single injector in the air intake. I would definately call Allen for a question like that though.