June 10, 2005My father is planning on buying a 95 S-10 that has a bad 4.3 in it. The bearings are spun. Anyhow I have a 88 4.3 that I was going to donate to the project but wasnt sure if the 88 short-block would accept the 95 intake, exahust and what not. If the block is alright to use then which heads do I use? Does it matter? Its a 2wd auto truck, dont know if that would change anything.
Forums : Engines-Gasoline : 88 4.3 in 95? (91 Views)
Subscribers : Dstumpy13
June 10, 2005From what I understand.
All the blocks are the same. The differences are in the heads, intakes, pcm, and wiring. You should be able to take the heads and intake off the '95 and drop them onto the '88 block and be OK.
I am doing something very similar. I have a '93 with a bad engine and am dropping in a older block from a fullsize truck. Although in my case, I think all I have to change is the intake.
It was either '94 or '95 when they changed the angles of the intake to head mating surfaces, and changed the angle of intake bolts into the heads. So in your case you will more then likely have to change out the intake and the heads.
One other thing to check that I can think of at the moment, is the timing cover and water pump. They changed when they went to serpentine belt. Pretty sure your '88 should be serpentine belt.
June 10, 2005Yep, the 88 is a serpentine. I thought I remembered that there was some dif from the old motors and the newer non-vortec motors. I thought it was something with the engine codes. Z versus W and there was another one too but Im not sure now. But it must have been the intake to head mating like you said. Thanks a lot Hanr2, I appreciate it.
June 10, 2005The intake mounting angles changed in 1996 with the introduction of the SFI Vortec engine. The heads on your 95 MAY be L35 heads (check if they have plastic valve cover that say 'Vortec). If so, you want to keep these during the swap. They flow a good 30cfm better than the older LB4 heads. Intake is the same from 88-95 in pickups (CPI - the W code engine - is very rare outside of Blazers, so I'm guessing they're both TBI - Z code).
Exhaust will bolt up fine, just take all the sensors off the bad engine, mark where they go, and attach them to the new one. You may need to remove a drain plug from the block to install the knock sensor, many of the 92+ models have one in the driver's side head, and your 88 most likely has it screwed into the top of the block (behind the oil pressure sender).
Post up if you need more info, that's what we're here for.
June 10, 2005Great info guys, thanks. We havent even bought the 95 truck yet, I just wanted to post and ask the fesibilty of the swap before my father spends the money on the truck. I'll give him the A-OK and will post again and let you guys know how the project went. On the topic of the heads, I know a Haynes manual has the torque specs for the heads, but what about valve lashing tolerances? If not where can I find that info? Thanks again.