Jump to content

Engine Swap

jefferias

Recommended Posts

jefferias Enthusiast

jefferias

Posted
Posted

hello everyone! Just lookin for a lil insight. i own a 1984 gmc sierra 1500 2wd. it has a tired 305 in it. i bought a targetmaster350 with 60000 miles on it out of a 93 2500 i believe. i have full intentions of switching the tbi to carbeurator and utilize an hei ignition. ( istill have to pull the motor out -but its mated to a turbo 350 tranny which is what i got.) so was just wondering bout the flywheel/flexplate, if there the same? i believe it has a 2 pc rear seal which is what i have right now as well. also, prolly dumb question, but uh, there are manifolds i can buy to switch over the tbi to a carb-hei ign setup right? anything else would be much appreciated. thanks

nhproxr Enthusiast

nhproxr

Posted
Posted
hello everyone! Just lookin for a lil insight. i own a 1984 gmc sierra 1500 2wd. it has a tired 305 in it. i bought a targetmaster350 with 60000 miles on it out of a 93 2500 i believe. i have full intentions of switching the tbi to carbeurator and utilize an hei ignition. ( istill have to pull the motor out -but its mated to a turbo 350 tranny which is what i got.) so was just wondering bout the flywheel/flexplate, if there the same? i believe it has a 2 pc rear seal which is what i have right now as well. also, prolly dumb question, but uh, there are manifolds i can buy to switch over the tbi to a carb-hei ign setup right? anything else would be much appreciated. thanks

 

'93 motor is a 1 piece seal motor. Went to 1 piece in '86. I believe it'll use a different flexplate. Don't think a '93 2500 is gonna have a th350 in it. I think at that point it would be a 4-spd with overdrive. Believe 93 is the year they went electronic with the trannys, so its a 4l60e in a light duty 2500 (6 lug wheels) or a 4l80e in a HD. If it is a 3-spd its a th400. Google the pan shapes for all these trannys and compare to what you have. Also the electronic trannys have a wire harness going into the side of it.

 

Also yes you can put any small block intake on there to convert to a carb. Only a problem for '96-up 350s with vortec heads.....can still run a carb just need a intake to run a carb w/vortec heads.

Genuinefine409 Enthusiast

Genuinefine409

Posted
Posted
Also yes you can put any small block intake on there to convert to a carb. Only a problem for '96-up 350s with vortec heads.....can still run a carb just need a intake to run a carb w/vortec heads.

 

 

in 1987 they changed the angle of the middle bolts, the four middle bolts are on a 72 degree angle. several companies make intakes for the 72 degree center bolt heads. some companies like professional products have bushings you use for the middle bolts which is nice if you'd ever switch to standard heads you could just remove the bushings.

jefferias Enthusiast

jefferias

Posted
  • Author
Posted

thanks alot guys. it is much appreciated. i still think its a 2 pc rear main because my boss put it in his work truck, he bought the crate motor straight from mehico lol. very well prolly is a th400 for the tranny i was just hoping the flexplate would be the same. i know its a 3 spd for sure. with the intake thankyou much for the info. one more question - the 350 motor uses a ugly and beefy serpentine belt setup, and i have the nice clean 2 v belt set0up (in my opinion) is there really any benefits to a serpentine because i want to use my v belt setup. again i thank you all in advance. opinions on headers as well would be nice-what kind, brand ,size ???

nhproxr Enthusiast

nhproxr

Posted
Posted

Forgot about the center bolt heads, you are correct about the middle bolts.

 

As far as sepertine vs. v-belts, serpertine belts are nice cause there's only one, they seem to slip less too. But of course the belt tensioner adds one more thing that can fail in this system, so there is some trade off. If it were me I'd go with the stock (to the '84) v-belts, this way you still can go to any auto parts store and get belts for the '84 without having to think about what the engine came out of.

 

Oh yeah for headers, I have cerma coated dynomax headers in my '77 and I like them. Whatever you get just make sure they have the thickest gauge tubing and especially mounting flange possible. Spend the money on quality gaskets too for the both the mounting flange and the exhaust flange. Sucks when your header to exhaust flange leaks constantly.

  • 3 weeks later...
jefferias Enthusiast

jefferias

Posted
  • Author
Posted

K here's what i found out. block is 10243880. heads are 14102193 it has one pc rear main seal. Measured the pushrod length and it is 7.8 inches so i believe it has flat tappet cam,from what ive read. non vortec heads. mechanical fuel pump plate bolted up. my questions:

1) will this cam have a lobe for the fuel pump?

2) will bellhousing bolts line up-i have a rebuilt turbo350 mated to a 84 305 right now

3) my guess is i have to use the flexplate on the new motor?(cause its 1 pc now)

4) oil pressure sending unit-iwanna use my 84 design to direct plug in-will it fit/work?

5) i think theres a knock sensor - can i just leave it plugged in hooked up to nothing?

any suggestions or thoughts would be greatly appreciated

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • CNH-320
      Electrical Problem - solved

      By CNH-320 · Posted

      Hey everyone, I recently had an issue with my 07 2500HD GMT900. My DRL’s stay on at all times. Right front turn and right mirror turn signal indicator stay on solid at all times. By “at all times” I mean the only way to make them go off is disconnecting the battery. I tore the headlight assemblies out, tried disconnecting the harnesses to eliminate bad wiring at the harness, I unplugged the headlight switch, no change and the mirror turn signal still stayed on. My first thoughts were : Bad bulb and/or socket somewhere, under hood fuse panel bad, bcm bad, tail light or trailer wiring problem, or some random short to power in the harness.  Possibly a bad ground but unlikely. I had a big clue in the fuse panel, it had a burnt smell. I started pulling every fuse that had to do with DRL or right turn/park lamp. Nothing made the right directional turn off but pulling the DRL2 fuse made the DRL’s go out.  After studying wiring diagrams, I found that both problems had that fuse panel in common, the bcm also controls both problems but knowing the fuse panel had a burnt smell I removed and disassembled the fuse panel and found a little corrosion on the printed circuit board.  I ordered a new fuse panel from Amazon for like $260. When it arrived I installed it, and put everything back together, the problem was fixed. I figured the fuse panel needed to be replaced anyway so that was a logical place to start. Hopefully this story helps someone in the future. Regretfully I didn’t scan for codes before I did everything.
    • 2022LtTbZ71
      Service 4wd, ESC light, traction control light on, Service charging system (vehicle may stall)

      By 2022LtTbZ71 · Posted

      That stinks. I’m sitting on the side of the road right now with the same issue. Never had an issue before taking it in for the ground strap recall. Now I’m outside of warranty and they’ll probably want $200 just to diagnose what they already “fixed”. 
    • jagabom (Esquire)
      Passenger seat

      By jagabom (Esquire) · Posted

      I wonder kind of nuts and bolts they will come up with next? Jim
    • OnTheReel
      The Peckish Synapse

      By OnTheReel · Posted

      “It should be recognized, however, that there becomes a point where fuel economy oils do not make much economic sense for the end consumer—we talk about a fuel saving of ~€100 compared to a risk of €1000 Euros if the oil is too thin and causes increased engine wear rates. However, the benefit of these oils accrues to the car manufacturers. If their vehicles can save 1–2% fuel by using a special fuel economy lubricant, then that OEM can drastically reduce the amount of fines they need to pay.”   I liked this and the following paragraph as well but it’s really only touching the beginning of the benefits OEMs see from spec’ing these oils. After you factor in “out of warranty” service work and new car sales when these engines fail before their time, it’s a good racket for them. Just because you're paranoid doesn't mean they're not out to get you!
    • Atlas
      The Peckish Synapse

      By Atlas · Posted

      Too much voodoo and snake oil.   Time to go EV    😉

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...