[Diy_efi] Swap 305tbi to 350tbi in GM truck

[Programmer]

You need to:

1. Use 5.7L injectors
2. Use a 5.7L calibration

OR

1. Use 5.0 TBI injectors (BTW--they're 50lb/hr units)
2. Correctly recalibrated PROM

Your truck will then be happy.

Lyndon

----- Original Message -----
From: "Kevin" <halifax at toad.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, March 27, 2003 3:50 PM
Subject: [Diy_efi] Swap 305tbi to 350tbi in GM truck


Understanding the basics of tbi operation what would be the best route for
tbi for this newbie. I am swapping my tired 305 for a new 350 in my '91
Silverado 4x4.

1)  Can I stay with my stock 305tbi (40lb/hr) or do I have to upgrade to
5.7L 55 lb/hr or caprice 65lb/hr for a stock 350?

2) If I do have to switch TBI units must I find a prom for this combo (5.7L,
700R4, 3.73 gears)  or will
my stock prom(5.0L, 700r4, 3.73 gears) adapt then pump enough fuel to
compensate for the change?  I don't want to run too lean & grenade my
project!

Thanks for any suggestions,
Kevin



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