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help from the guys running 402 408

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Old Nov 26, 2007 | 02:10 PM
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knuckles
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Default help from the guys running 402 408
i am going from a 5.3l to a 405 what changes do i need to make to the fuel system? do i need bigger pump injectors. will it run or start up on the stock tune?
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Old Nov 26, 2007 | 02:14 PM
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This should get you going:
https://www.performancetrucks.net/forums/search.php
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Old Nov 26, 2007 | 02:26 PM
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Originally Posted by knuckles
i am going from a 5.3l to a 405 what changes do i need to make to the fuel system? do i need bigger pump injectors. will it run or start up on the stock tune?
Probably would be wise up upgrade injectors. We need more details on your setup. What cam, what heads, plans for FI in the future, power goals, what year is your truck, etc etc.
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Old Nov 26, 2007 | 02:36 PM
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Originally Posted by RandomHero
Better yet....



OR






I have no clue, but more than likely you will need injectors...
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Old Nov 26, 2007 | 02:37 PM
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ported 243 heads cam is 235 dur truck is a 2000 no plans for fi it is going to be 10.5:1
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