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Can I start my 408???

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Old 12-26-2008, 08:36 PM
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Default Can I start my 408???
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??
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Old 12-26-2008, 08:50 PM
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IF it'll start. Cammed 408 on a 4.8 tune. that'll run like crap if it'll even run.
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Old 12-26-2008, 08:59 PM
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haha... I just want to make sure I got oil pressure and all

but that what I was thinking.
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Old 12-26-2008, 09:01 PM
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Personally I would wait. That is going to run very lean if it manages to start.
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Old 12-26-2008, 09:01 PM
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It should start
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Old 12-26-2008, 09:25 PM
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It'll fire, may hold a poor idle however i'd choose otherwise IMHO. Too many potential issues outweigh the benefits.
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Old 12-26-2008, 09:43 PM
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think a mail order tune with mild timing will suffice till I get it tuned properly?
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Old 12-26-2008, 10:24 PM
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If you have the same injectors and a MAF still installed, then you should be ok to start it.
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Old 12-26-2008, 10:27 PM
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everything is the same.
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Old 12-26-2008, 10:45 PM
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Originally Posted by cellulis44
everything is the same.
get new injectors......

thats a nightmare waiting to happen.

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