Thread: 4.3 to 350 questions

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i already know headers and all that but my question is electrical. My 92 1500 has a TBI 4.3 and im switching to a carbeurated 350. do i need a new computer? and a friend told me theres some kind of fuel governor that will shut the 350 off at 4250rpm. that was in an s10, is it the same for my full size? and do i even need any of this with a carb?

Originally posted by muteboy49
i already know headers and all that but my question is electrical. My 92 1500 has a TBI 4.3 and im switching to a carbeurated 350. do i need a new computer? and a friend told me theres some kind of fuel governor that will shut the 350 off at 4250rpm. that was in an s10, is it the same for my full size? and do i even need any of this with a carb?

if you're going to a 350 carb. with HEI dist. you won't need a computer. put a 6 lb. fuel pump on it and ride. or make your elec. fuel pump hot with key on and put a reg. in the line you have.

thank you i asked everyone i know and they gave me the run around. very nice truck by the way!

Originally posted by muteboy49
thank you i asked everyone i know and they gave me the run around. very nice truck by the way!

thanks, you won't get you leg pulled here. if i can help you some more just ask.

wont my 350 bolt up in the same mounts as the 4.3? and will i have to do any modifications to my truck?

Originally posted by muteboy49
wont my 350 bolt up in the same mounts as the 4.3? and will i have to do any modifications to my truck?

i've never did that swap, but i'm gonna say the 350 should set in there without a problem. the exhaust y-pipe might be dif. but its a easy swap. i cant think of any modifications to the truck though.

exhaust is nothing i want open headers lol .will i have to move the trans crossmember back to make up the length of the 350?

Originally posted by muteboy49
exhaust is nothing i want open headers lol .will i have to move the trans crossmember back to make up the length of the 350?

i dont know what trans. you have now, but here is a chart of the dif. trans. ill let you tell me.

http://www.tciauto.com/tech_info/trans_dims.htm

i think im going to buy a TH350

wait...my trans now shifts real late (the bad way slipping!) will one of those shift kits solve this problem?

Originally posted by muteboy49
i think im going to buy a TH350

thats a good trans.

thats what ive been told.

Originally posted by muteboy49
wait...my trans now shifts real late (the bad way slipping!) will one of those shift kits solve this problem?

if its sliped a lot, it will ware the fiber off the clutches and then they need to replaced. the kit wouldnt help.

then yes a TH 350 what did GM put them in?

Originally posted by muteboy49
then yes a TH 350 what did GM put them in?

just about everything from 1970 to about 1990. rear wheel drive.