I just finished installing my 408.. Replaced my 4.8 with it...

My question is, can I start my new engine with the 4.8 tune just to make sure it fires and there are no leaks ect. Mods to the 4.8 were a tr220 cam, and long tubes... Nelson tuned. The mods to the truck are 2.5 prc's, 237/242 cam, lt's, and 11:1 stcr.

so.. can I start it and let it warm up??

 

IF it'll start. Cammed 408 on a 4.8 tune. that'll run like crap if it'll even run.

 

haha... I just want to make sure I got oil pressure and all

but that what I was thinking.

 

Personally I would wait. That is going to run very lean if it manages to start.

 

It should start

 

It'll fire, may hold a poor idle however i'd choose otherwise IMHO. Too many potential issues outweigh the benefits.

 

think a mail order tune with mild timing will suffice till I get it tuned properly?

 

If you have the same injectors and a MAF still installed, then you should be ok to start it.

 

everything is the same.

 

get new injectors......

thats a nightmare waiting to happen.

Go with 8.1L marine injectors and you should be fine.