1
Welcome,
Guest
. Please
login
or
register
.
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
News:
Registration and Posting Agreement
Home
Forum
Store
Help
Search
Gallery
Login
Register
73-87chevytrucks.com
»
73-87 Chevy _ GMC Trucks
»
Engine/Drivetrain
»
1986 305 to 350 Vortec Swap
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: 1986 305 to 350 Vortec Swap (Read 3726 times)
Jeff86inMS
Newbie
Posts: 44
Newbie
1986 305 to 350 Vortec Swap
«
on:
January 14, 2019, 02:51:28 PM »
Hello all,
I have a 1986 C10 stepside custom deluxe that originally came with a 305 V8. I'm getting ready to swap it for a 350 Vortec V8 with Carb. My question is, will the exhaust manifolds from the 305 swap over to the 350 Vortec? I know the intake manifold is different. Need to know about the exhaust ones though. Thanks!
Jeff
Logged
VileZambonie
Global Moderator
Senior Member
Posts: 19114
Re: 1986 305 to 350 Vortec Swap
«
Reply #1 on:
January 14, 2019, 04:40:32 PM »
Yes but why not run headers? Exhaust manifolds will choke that thing right out
Logged
, ___
/ _ _ _\_
⌠ŻŻŻŻŻ' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
Jeff86inMS
Newbie
Posts: 44
Newbie
Re: 1986 305 to 350 Vortec Swap
«
Reply #2 on:
January 14, 2019, 05:04:39 PM »
I will probably run headers later on, but trying to just stick to the items I have to have to get it installed.
Sent from my iPhone using Tapatalk
Logged
Ronno6
Frequent Member
Posts: 290
Elder Student
Re: 1986 305 to 350 Vortec Swap
«
Reply #3 on:
January 14, 2019, 10:24:52 PM »
Exhaust manifolds should oughta bolt right up.
Logged
You can lead a man to water, but yoiu can't keep him from pissing in it.
JohnnyPopper
Senior Member
Posts: 2662
Old Goof
Re: 1986 305 to 350 Vortec Swap
«
Reply #4 on:
January 15, 2019, 12:46:27 PM »
Unless you need a manifold spreader tool.
I just had my 350 swapped out, and the mechanic showed me a tool to spread the the outer manifold ports away from the center ports.
Wish I had known about them the last time I changed the manifold gaskets, would have been a lot less &&%$#(!!!@#^%$#!!?
!!
Logged
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
zieg85
Global Moderator
Senior Member
Posts: 7567
Re: 1986 305 to 350 Vortec Swap
«
Reply #5 on:
January 15, 2019, 12:57:23 PM »
The only caution would be the dipstick location clearing the manifolds.
Logged
Carl
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/
75gmck25
Frequent Member
Posts: 439
1975 GMC K25 Camper Special, 350/TH350/NP203
Re: 1986 305 to 350 Vortec Swap
«
Reply #6 on:
January 16, 2019, 09:10:21 PM »
I had to use a manifold spreader tool to get one of the manifolds back on my new heads, so I actually read the directions. It worked very well. They recommended also using the tool before you remove the manifolds so that you can remove sideways pressure and get the bolts to come out without binding. The only local parts store that had the tool on hand was NAPA, but lots of places sold them online for $11-12.
Bruce
«
Last Edit: January 16, 2019, 09:12:19 PM by 75gmck25
»
Logged
JohnnyPopper
Senior Member
Posts: 2662
Old Goof
Re: 1986 305 to 350 Vortec Swap
«
Reply #7 on:
January 17, 2019, 06:26:25 PM »
It's the little things...
Logged
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
fitz
Senior Member
Posts: 2085
Re: 1986 305 to 350 Vortec Swap
«
Reply #8 on:
January 17, 2019, 06:52:55 PM »
Quote from: JohnnyPopper on January 17, 2019, 06:26:25 PM
It's the little things...
1 more thing to look into is the distributor gear. You might need a different gear with the roller cam.
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
73-87chevytrucks.com
»
73-87 Chevy _ GMC Trucks
»
Engine/Drivetrain
»
1986 305 to 350 Vortec Swap