will a 4.3l computer work with a swapped 350?

[gmcguru32]

my 4.3l V-6 is coming out and my new 350 is going in...im keeping the automatic and everything and i was wandering if the computer would work on the 350 that came off the 4.3L...thanks alot!

[92BlueZ71]

nope, you gotta change the computer unless its carbureted.

[gmcguru32]

its tbi...

[chevyguy]

Gotta change it.

[gmcguru32]

ok thanks...well i just got the 350 out today...then i took my 262 (4.3) out ...then i put the 350 in and the motor mounts are like 4 1/2 inches back too far and i dont think there is like no way to move them...do you guys have any ideas or should i go get a new motor???thanks-ryan

[mudseeker]

drop the motor on the mounts and relocate the trans. to meet the engine. the mounts should match up without doing this though.

[gmcguru32]

well if i move the motor back...i need to cut out the firewall...move the tranny crossmember back...then get my driveshaft shortened...i was wandering if there was any way to get around doing all that...

[mudseeker]

if this is a s-10 truck then you will need to do some cutting, but if it is a full-size truck then it should fit with no problem since v-8's were a factory option. what year is the truck and the engine?

[project88]

maybe i am missing something here, but what did the 350 come out of, you might need mounts from a chevy truck if the 350 is not from another chevy truck, i believe the frame stays stationary, but the mounts on the engine can be changed,

I stand to be corrected.

If you have to cut the firewall out to get it in, its the wrong mounts for sure!

[gmcguru32]

my truck is a 1993 gmc sierra 2wd...original with a 4.3l (262)
i got the 5.7 (350) from a 1991 gmc 4wd...
both fullsize and eevrything...but the mounts are nothing alike...
the 350 mounts 4 1/2 inches further ahead than the 262 moutns...and the mounts are not bolted to the frame...they are welded...
and i have a crossmember that my motor the 4.3 sat on and the 350 need to sit lower than that and the crossmember is welded on also...a bunch of problems here...everyone i talked to said that it would fit...(mounts, electrical, no crossmember problems. all i would have to change was the computer...) well here is a prime example that it wont come even close to fitting...i thnk im just going to buy a new 4.3 and put that 350 out with the trash!!!