What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

350 Vs. 379

DieselWarrior

DieselWarrior

1/2 ton status
Joined
Jun 3, 2010
Posts
678
Reaction score
0
Location
LowBuck-LowTech
Was wondering what the values were for the 5.7l gas was compared to the 6.2l diesel in HP and Tq (FtLBs)? I did some Googling and was not able to find something applicable to the K5.

Looking for early to mid 80's figures, just curious.

Thanks....
Andrew
 
The 350 in the same era was a 165 hp monster stock. tq was 260 IIRC.

Rene
 
The 350 had 165 HP @ 3800 rpm 275 lb ft of torque @1600 rpm

379 130 HP at @3600 240 lb ft @ 2000

The 305 was 160 and 235 respectively

These numbers hold true from 83-86

A 91 350 made 210 hp and 300 lbs ft
145 and 260 from the 379

These are the numbers are the same for 89 to 91 with the exception of the 91 getting 5 lbs ft of torque more. so the 88-89 only had 255 lb ft of torque
 
Numbers seem to vary by source but blazinzuk has a good baseline.
 
The numbers for the 6.2 seem to be a little harder to find and can vary, but I would say those listed above are least a good baseline. I know this isn't really the question but you can give the 6.2 a decent power boost by turning up the pump slightly, and even drop on a J-code intake.

I've owned a '90 K5 with the 6.2 since 1994. It was stolen around '96-'97 and before it was recovered I looked at buying a low mileage '91 350 powered K5 from a good family friend......there really wasn't much of a significant seat-of-pants feelings IMO.
 
Thanks guys, great info...

Question about the J-Intake... Is it worth the trouble to locate and install one? Seat of the pants dyno results would be welcomed. :laugh:

Andrew
 
Top is a dual plane, you don't want it.

Middle is a single plane J code, you want it. Only thing is you should find out what it was off of. HMMWV intakes look similar and don't work correctly for us. I made the mistake of buying one then only barely managed to make my money back selling it.

Bottom is a C code...aluminum scrap.





I can dig up the number of the place that sold me my NIB J code intake if you want. $75 or so but it was pristine. Well, dusty...but pristine.
 
also remember, power ratings are subjective. couldnt really tell you why, but for instance a big debate i used to bear witness to on a regular basis on the track was if you built a sbc and bbc to identical specs, bore, stroke, displacement, cfm through the heads, which would make more power, and which would be faster at the track.

Ive driven many 305 and 350 trucks like my blazer, and even with its 3.08 gears and 33's i like the way mine drives wayyyy more.
 
I like my 6.2 too. Its slow but it just keeps on pulling feels like it would pull forever. Should help a ton with my new 4.56s in it
 
There is nothing wrong with the dual plane 'J' code...it may flow a little less than the single plane version but I doubt you'd notice. Either version of 'J' code will significantly outflow the EGR 'C' code intake. Regardless of which one you get, a gasket match job on the ports and a little blending will make it flow to it's potential. The casting quality on the 6.2 intakes isn't exactly the best. On my 'J' code the ports were much smaller than the head ports and were all shifted. Almost every port needed to be opened up by .250" total, and that was usually mostly on one side.

Rene
 
Only thing with the dual plane is you need TWO CDR valves and the associated plumbing. They're hard enough to find I decided on sticking with the the single plane that required one.
 
You must log in or register to reply here.

Latest Posts

Top Bottom