I have a 97 Silverado that had 200,000 miles on a 5.3 vortec fuel injected motor. I pulled that engine out. I pulled another 5.3 from an old camper that only had 50,000 miles on it, this one was throttle body injected though. So I took the block from the throttle body injected motor, rebuilt the top of the fuel injected motor, and put it together. I noticed that the heads from the tbi motor are higher than the ones from the fuel injected motor. Now my lifter rods are too short. So the question is, what sized lifter rods should I get to make this work?

 

Will the lifter rods from the other motor work?

 

They might of but I sold them with the other heads not even thinking about this problem, so now I'm not sure what size ill need.

 

You should be able to go to any parts store and get a set for a Vortec motor, and they will work. The heads and injector setup are the main difference in a TBI and Vortec motor. Hope this helps