swap 4.3 to 5.3
#2
First you will need A search button that works... 
This has been covered more then once over the years but I Believe this is one of the best documented ones at least on this site. If not I am sure some one else will chime in.
https://www.performancetrucks.net/fo...d.php?t=378643
Then you will need a complete 5.3L with ALL the V8 parts for your model year application. A V8 wiring harnes again for your model year and PCM programed for that application.
Hope that gets you in the right direction.

This has been covered more then once over the years but I Believe this is one of the best documented ones at least on this site. If not I am sure some one else will chime in.
https://www.performancetrucks.net/fo...d.php?t=378643
Then you will need a complete 5.3L with ALL the V8 parts for your model year application. A V8 wiring harnes again for your model year and PCM programed for that application.
Hope that gets you in the right direction.
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