Vortec headed 355 sbc with center bolt headed 305's intake/TBI
Feb 12, 2014 | 04:22 PM
#1
Thread Starter
Teching In
Joined: Jan 2014
Posts: 13
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From: LaGrange, GA
Vortec headed 355 sbc with center bolt headed 305's intake/TBI
Aye, fellas! First off, awesome site! Second, I have a carbed 355 with vortec heads tha I want to put in my 1990 2wd Silverado 1500 which currently has a 305 in it. can the intake/TBI be used as a direct bolt on? I was figuring it would with both engines having center bolt heads. If anything else is needed please let me know. Thanks!!
Feb 13, 2014 | 05:00 PM
#4
Joined: Oct 2004
Posts: 4,985
Likes: 54
From: somewhere in TX
It will be fine but you are going to have to find someone to custom burn a chip or it will run terrible.
My experience on all TBI stuff is the early computers suck. I always swapped out to a 95 pcm and had a chip burned it was the best chance at any hint of driveability with a cam.
Once done they alway's run better the 95 pcm's are waaay faster and can respond to changes in map from a cam better than their slow predecessor's.
Just find a donor truck get the computer and cut about a foot of the harness off behind the pcm connectors. Then get out soldering gun heatshrink and a diagram and begin the retrofit. With the 95 pcm you also change to a heated HO2S which also helps out a bunch with proper fueling.
My experience on all TBI stuff is the early computers suck. I always swapped out to a 95 pcm and had a chip burned it was the best chance at any hint of driveability with a cam.
Once done they alway's run better the 95 pcm's are waaay faster and can respond to changes in map from a cam better than their slow predecessor's.
Just find a donor truck get the computer and cut about a foot of the harness off behind the pcm connectors. Then get out soldering gun heatshrink and a diagram and begin the retrofit. With the 95 pcm you also change to a heated HO2S which also helps out a bunch with proper fueling.
Thanks tons, man! As soon as I get my stuff together, Ill update you on tha outcome!
Feb 16, 2014 | 10:50 AM
#6
TECH Enthusiast
Joined: Oct 2006
Posts: 642
Likes: 21
From: Euless, TX
It will be fine but you are going to have to find someone to custom burn a chip or it will run terrible.
My experience on all TBI stuff is the early computers suck. I always swapped out to a 95 pcm and had a chip burned it was the best chance at any hint of driveability with a cam.
Once done they alway's run better the 95 pcm's are waaay faster and can respond to changes in map from a cam better than their slow predecessor's.
Just find a donor truck get the computer and cut about a foot of the harness off behind the pcm connectors. Then get out soldering gun heatshrink and a diagram and begin the retrofit. With the 95 pcm you also change to a heated HO2S which also helps out a bunch with proper fueling.
My experience on all TBI stuff is the early computers suck. I always swapped out to a 95 pcm and had a chip burned it was the best chance at any hint of driveability with a cam.
Once done they alway's run better the 95 pcm's are waaay faster and can respond to changes in map from a cam better than their slow predecessor's.
Just find a donor truck get the computer and cut about a foot of the harness off behind the pcm connectors. Then get out soldering gun heatshrink and a diagram and begin the retrofit. With the 95 pcm you also change to a heated HO2S which also helps out a bunch with proper fueling.
Dynamicefi.com if you want to stick with the older style ECM. No chip burning needed.
Feb 16, 2014 | 11:50 PM
#7
Joined: Oct 2004
Posts: 4,985
Likes: 54
From: somewhere in TX
Use solder barrels crimp solder and heat shrink I've never had a problem w reliability yet and the pcm terminals and connector shells are different in the 93_95 putters vs the 88_92pcms.
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Feb 17, 2014 | 04:36 PM
#8
TECH Enthusiast
Joined: Oct 2006
Posts: 642
Likes: 21
From: Euless, TX
The connectors are different but the pins that are attached to the wires are the same and easily unpinned. 85-96 TBI and 85-92 TPI all use the same ECM connector pins on the wire ends but different connectors. It takes me all of 10 minutes to repin the connectors.
Feb 18, 2014 | 06:26 AM
#10
TECH Enthusiast
Joined: Oct 2006
Posts: 642
Likes: 21
From: Euless, TX
My 1983 G20 used the same 1990 G20 TBI harness for the early TBI ECM, then later PCM, then MAF TBI, then TPI, before being swapped to a 7730 TPI ECM.
Tje last engine in this was a 380 rwhp/425 rwtq 383 TPI and I had it totally gutted inside, down to 4,500 lbs.
