3.8 2 bbl carb swap to 4.1 4 bbl carb

[G_Body_Enthusiast]

is changing the PROM in the computer necessary in order to swap carbs? i'm thinking it's not really needed but helpful. i'm thinking of doing this swap just to give my 3.8 some more *ss while waiting to get enough money to buy a nice buick 350 to drop in. dualjunks are teh suxorz!

 

[DoubleV]

is changing the PROM in the computer necessary in order to swap carbs?

No.

 

[Peter]

i got a 4 barrel intake with egr that i was going to use if you are interested. pm me

 

[G_Body_Enthusiast]

i have the intake off a 4.1 i had in an 82 GP LJ i owned a few years ago. i was just wondering about the prom thing.

what i really need is a carb, i have everything else down to the last bolt and bracket. just need a carb off a 4.1 and the fuel line to it and i'm set to swap em out. i just wasnt sure about the PROM since i didnt pull the one in the 82 as i didnt even consider i might have needed it but it seems i dont.

i've even been removing material in the intake to improve air flow. they cast these things with bottle necks in the secondaries and the primaries have a bore themselves that dont exactly allow the air fuel mixture to go into the intake runners in a straight shot. not sure if i'm going to remove the casting flash and gasket match the runners yet, i just want to open the top end of the intake first though i'm sure smoothing the runners would help even more.