305 5.0 vortech to 350 5.7 vortech swap


Asked by David Apr 28, 2017 at 12:56 AM about the 1998 Chevrolet C/K 1500

Question type: Maintenance & Repair

All Questions
jowoonsocket about a year ago can I switch my
1996 k1500 305 motor and tranny for a 350
I bought a 96 k1500 4x4 with a bad tranny and now
the head gasket went, I don't feel like repairing it
has 230000 but I cant find a decent 305. I found a
97 with a rotted frame but motor and tranny have
127000. I wanted to know if I do change over will I
need to change the harness and the computer

1996 Chevrolet C/K 1500 Silverado Standard Cab
SB Car Customization
935 12
tennisshoes about a year ago
Best Answer
To make sure everything will work you will have to
do that.

1 person thinks this is helpful.
Andrew about a year ago
Best Answer
It's all the same. If it's a 350 go ahead and take the
computer so it's programmed for one.

1 person thinks this is helpful.
James about a year ago
Best Answer
All Chevy bolt patterns are the same. Different
engines & transmitions bolt togeather, & most use
the same motor mounts too. Use everything that
goes with 97' engine too. 350 for a 305 is a good

1 person thinks this is helpful.
Kelly about a year ago
Best Answer
5.0 and 5.7 used the same ECM The 5.0 pcm will
not lean out the 5.7 engine at all. the 02 sensors
will correct the fuel mixture and you will not have
any trouble with running what you have already.
The only reasone you would need to make any
mods to the pcm or the wire harnss would be if you
where going from a 4.3 to a 5.7.

1 person thinks this is helpful.
Andrew about a year ago
Best Answer
Your telling me a pcm programmed to an engine
flowing 305 ci worth of displacement that uses a
MAF sensor isn't going to tell a difference in
another 45 ci of displacement? The maf reading
alone will be different, the fuel trim tables will be
too lean. It will run, no doubt about that but it won't
be right.

1 person thinks this is helpful.
Kelly about a year ago
Best Answer
yep. gm says there both in the same
parametersFYI... several GM trucks use the same
16197427 ECM for 5.0 and 5.7 just change out the
chip if you want.. CHEVROLET ASTRO (1994 -
1995) CHEVROLET BLAZER (1994 - 1995)
CHEVROLET C1500 PICKUP (1994 - 1995)
CHEVROLET C2500 PICKUP (1994 - 1995)
CHEVROLET C2500 SUBURBAN (1994 - 1995)
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EXPRESS 2500 1996 CHEVROLET G10 (1994
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K1500 PICKUP (1994 - 1995) CHEVROLET
K2500 PICKUP (1994 - 1995) CHEVROLET
K3500 PICKUP (1994 - 1995) CHEVROLET
P30 (1995 - 1997) CHEVROLET S10 BLAZER
(1993 - 1994) CHEVROLET S10 PICKUP (1993
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SUBURBAN (1994 - 1995) GMC C2500 PICKUP
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G1500 (1994 - 1995) GMC G2500 (1994 -
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GMC K3500 (1994 - 1995) GMC P3500 (1995
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454EDDIE 6 months ago
Best Answer
Can I put a 1995 Tahoe motor in my 1990chevy

1 person thinks this is helpful.
Andrew 6 months ago
Best Answer

454EDDIE 6 months ago
Best Answer
Is the wiring harness the?

Andrew 6 months ago
Best Answer
Yes, as long as they are the same engine size you'll
be good. Going v6 to v8 would be alittle more
involved. And switching from a 305 to 350 will be
plug and play but I would advise the appropriate
pcm to go with the motor

Muddyblazer about a week ago
Best Answer
I've got a brand new 2000 350 long block what do I
need to do to make it work in my1993 truck
I just bought a 98 chevy silverado 1500 305 5.0
liter v8 vortec that had a lower end knock so i
bought a 96 gmc with a 350 5.7 liter v8 vortec for
the motor. The swap went good and everything
bolted up and plugged in without any problems.
After i got everything bolted down, plugged in and
fluids in it, it started no problem. After driving it a
week now, i believe the pcm has not learned the
difference from the 305 to the 350. I hear it
backfiring when im coasting and the motor cuts
out and picks right back up randomly while driving.
Im looking into having my pcm reprogrammed
locally or putting the prom chip from the pcm in
the 96 sierra in the pcm thats in the 98 and already
programmed to my vin. Will this actually work and
if so do i need to do the crank variation relearn or
any other modification or tuning to make it work?

3 Answers


So, what is the question you are asking?

6 people found this helpful.

Will an early 80's 305 work in a 94 Chevy pickup

1 people found this helpful.

changed the motor in my truck from a 305 to a 350 gov 1998 wondering will the 305 computer work for the 350 motor?

14 people found this helpful.

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