Which 350 setup would you buy to replace your 305?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

maxtwms

Full Access Member
Joined
Jan 29, 2014
Posts
170
Reaction score
33
Location
Alabama
First Name
Max
Truck Year
1985
Truck Model
K10
Engine Size
305
Assuming around 2-3 grand, just engine, heads, and intake manifold, which Summit or your preferred dealer setup combo would you want?

4x4, Daily driver, hauling things here and there, climbing hills, not having a pansy truck.

Feel free to include extras, I know they're coming.

Sent from my SM-G965U using Tapatalk
 

Rusty Nail

Full Access Member
Joined
Jan 29, 2015
Posts
9,789
Reaction score
9,686
Location
the other side of the internet
First Name
Rusty
Truck Year
1977
Truck Model
C20
Engine Size
350sbc

4WDKC

Full Access Member
Joined
Jan 27, 2016
Posts
2,366
Reaction score
1,090
Location
Southern Florida
First Name
Kacy
Truck Year
1987
Truck Model
V10
Engine Size
350
if there is any chance you might think about swapping to LS later, just do it now. The stock 4.8l make more power than a stock 350 has in the last 45 years.
 

poboy73

Member
Joined
Jan 29, 2018
Posts
32
Reaction score
20
Location
Green Bay, WI
First Name
Brian
Truck Year
1986 GMC
Truck Model
K1500
Engine Size
350

maxtwms

Full Access Member
Joined
Jan 29, 2014
Posts
170
Reaction score
33
Location
Alabama
First Name
Max
Truck Year
1985
Truck Model
K10
Engine Size
305
if there is any chance you might think about swapping to LS later, just do it now. The stock 4.8l make more power than a stock 350 has in the last 45 years.

There's a part of me that wants to keep the truck as period specific as possible, if you know what I mean. The more I think about it, I'm leaning more towards a 383 and 4.10 gears (from 305 and 3.08, pansy). I would like to just drop in a new small block without all the headache of swapping out more than desired that comes with an LS1. Maybe Ive been mislead. I know there's more bang for your buck with the LS1, just not sure I want to go mashing up different generational main components. Any water to be carried there?
 

DoubleDingo

Full Access Member
Joined
Jul 3, 2012
Posts
10,202
Reaction score
14,517
Location
Right where I am
First Name
Bagoomba
Truck Year
1981, 1965
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
Engine Size
Carb'ed Vortec 350; 1972 L48 350
a crate vortec 350 from gmperformance which I believe is also sold by summit. I swapped the heads on the stock 350 in my '81 to vortec and was impressed by the increase in power with the stock cam. Then I later took out the engine to reseal the entire thing, and while it was out I put in a 327/300 camshaft kit and that produced even more usable power.
 

DoubleDingo

Full Access Member
Joined
Jul 3, 2012
Posts
10,202
Reaction score
14,517
Location
Right where I am
First Name
Bagoomba
Truck Year
1981, 1965
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
Engine Size
Carb'ed Vortec 350; 1972 L48 350
There's a part of me that wants to keep the truck as period specific as possible, if you know what I mean. The more I think about it, I'm leaning more towards a 383 and 4.10 gears (from 305 and 3.08, pansy). I would like to just drop in a new small block without all the headache of swapping out more than desired that comes with an LS1. Maybe Ive been mislead. I know there's more bang for your buck with the LS1, just not sure I want to go mashing up different generational main components. Any water to be carried there?

I am in the court of no LS, mainly because a good 350 engine build can produce decent power and economy and it is much easier to swap because there is no rewiring or reworking of stuff. Can it make the power of an LS and get the improved mileage? Probably not as much of an improvement as the LS. Another reason for the no LS for me personally, here in CA, if you run a newer engine you have to change all of the emissions equipment to match the newer engine. So it is much more involved but can be done by work with the Referee. Now I could swap in an LS into Crusty Biscuit without dealing with emissions crap, but I like the simplicity of the old technology.
 

Crispy

Full Access Member
Joined
Apr 5, 2017
Posts
1,454
Reaction score
1,390
Location
Carbon County, Pennsyltucky
First Name
Chris
Truck Year
1989
Truck Model
Suburban V1500
Engine Size
5.7
Its all personal preference. I know I wanted easier starts, more economy, and more power. It was easy to decide on a LS swap and 4 speed auto. Theres always something to be said about a powerful small block and a set of flowmasters but eventually my Burb will be a daily driver so that direction made the most sense to me.

As for the ease, or quickness of the swap, a 350 will be your best bet and you can allocate more of your funds to a sweet engine as opposed to having to spend on swap components and integration of an otherwise stock LS.
 

77 K20

Full Access Member
Joined
Nov 9, 2012
Posts
3,076
Reaction score
3,051
Location
Montana
First Name
Mike
Truck Year
1977
Truck Model
K20 5" lift
Engine Size
HT383 fuel injected
I think it was rich weyand? Who posted about just using the standard GM truck crate engine but swapping out the cam to something else. Put out a lot of torque at a low RPM. I'm going to see if I can find that... maybe someone has it bookmarked?
 

77 K20

Full Access Member
Joined
Nov 9, 2012
Posts
3,076
Reaction score
3,051
Location
Montana
First Name
Mike
Truck Year
1977
Truck Model
K20 5" lift
Engine Size
HT383 fuel injected
Aha! Found it:

"Buy the Chevrolet Performance 10067353 engine at JEGS for $1500 delivered. Put the Comp Cams 12-235-2 cam in it before you even run it. Use the springs and lifters that are already in it. Put a dual plane manifoldlike Edelbrock 2101 or 2701 on it.

290 hp @4000, 415 lbft @2500."


http://www.gmsquarebody.com/threads/affordable-engine-replacement.16564/

Kinda wish I would have went this route instead of my 383. Would have had less issues and saved some money.
 

Rusty Nail

Full Access Member
Joined
Jan 29, 2015
Posts
9,789
Reaction score
9,686
Location
the other side of the internet
First Name
Rusty
Truck Year
1977
Truck Model
C20
Engine Size
350sbc
I vote no LS. Gen 1 or bust because I too enjoy "period correctness". My '77 has a Holley "Contender" manifold on it and an 80457. I believe that type of thing ADDS value to the truck - in that sense- whereas an LS swap detracts from THAT TYPE of value. They look awkward and out of place to me and the answer is no. Not in MY TRUCK! Unreliable and unpredictable. No.

People are GIVING AWAY Gen1 parts these days. Later i'll post the insane amount of stuff GIVEN to me today. Dude called me old school and said that I am the only person he knows still building Gen1.
Sweet. Hook it upp! Badge of honor.

Cold day in hell before I go about adding computers to a 40 year old part of Classic Americana...then you would have to call it something else!

They're junk anyway. Don't last. Built to be disposable...all hp cant make torque so they're slow . Screamin meanies without balls.

I didn't post the 260 horse engine thinking you should run it like that @rich weyand .
Swap heads, swap cam and THEN youre talkin! but whatever...
 
Last edited:

DoubleDingo

Full Access Member
Joined
Jul 3, 2012
Posts
10,202
Reaction score
14,517
Location
Right where I am
First Name
Bagoomba
Truck Year
1981, 1965
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
Engine Size
Carb'ed Vortec 350; 1972 L48 350
Aha! Found it:

"Buy the Chevrolet Performance 10067353 engine at JEGS for $1500 delivered. Put the Comp Cams 12-235-2 cam in it before you even run it. Use the springs and lifters that are already in it. Put a dual plane manifoldlike Edelbrock 2101 or 2701 on it.

290 hp @4000, 415 lbft @2500."


http://www.gmsquarebody.com/threads/affordable-engine-replacement.16564/

Kinda wish I would have went this route instead of my 383. Would have had less issues and saved some money.

That's it! It does void the warranty, but you gain power right off the bat and what is the chance of a fresh new engine going bad.

I ran the piss out of a crate engine in Mean Green, it lacked the torque due to the cam, but I made land speed records in that truck running an SM420 and 3.54 rear end gears. It loved to cruise at 80 mph all day (3,000 RPMS) and at the time could out run most anything on the open road if I wanted to go faster. That was before everything changed and the high horsepower stuff came into production, but man that truck was fun to drive with that setup. I can imagine what it could do with more torque....YEEHAW!!! One example...My drive to work was 17 miles one way from the front of my house to the courthouse where I parked on the street. Was running a tad late one morning and made it to the work parking spot in 8 minutes. Fun stuff!
 

maxtwms

Full Access Member
Joined
Jan 29, 2014
Posts
170
Reaction score
33
Location
Alabama
First Name
Max
Truck Year
1985
Truck Model
K10
Engine Size
305
Man y'all are making me want to pull the trigger already. I thinking I've found the right crowd. I always felt like these trucks should have nothing less than a 350 and that was enough to make all the power you reasonably needed if you knew how to manipulate the running gear and so forth. Glad to see gen I die hards. I'll be back for that crate, cam upgrade with prob vortev heads. Couldn't break the bank with that setup

Sent from my SM-G965U using Tapatalk
 

Forum statistics

Threads
42,158
Posts
910,307
Members
33,655
Latest member
djisurfli
Top