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Old 11-03-2009, 01:35 PM   #1 (permalink)
JLanzino
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6.2L vs 6.5L

Hi Guys Over The Years I`ve Heard Both Sides and Was Wondering Which of The Two Engines (6.2 vs 6.5) is Really The Better One.

Thanks Guys

JL
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1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 305`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 411`000KM, Dailey Driver
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
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Old 11-03-2009, 01:47 PM   #2 (permalink)
mattthebrat
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It really depends on what you want to do.....If you want to go fast and tow big loads, the 6.5 is for you, if you want to get the best possible fuel mileage, and do it on the cheapest possible budget, the 6.2 is for you.

Of course some will argue that a 6.2 turbo is the best combination of the two......
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Last edited by mattthebrat; 11-03-2009 at 01:48 PM.
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Old 11-03-2009, 04:46 PM   #3 (permalink)
vstech
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the 6.5 599 block is a better stronger block than the majority of the 6.2 blocks and it rarely cracks... I have three 6.2's and one 6.5... like said above, it depends on application.
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Old 11-03-2009, 06:36 PM   #4 (permalink)
4320Diesel
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6.2s FTW! lol yea like matt says. im still a die hard 6.2'er youll never find me drivin a 396 CID diesel when i can drive a 379!
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1995 Dodge 2500 Cummins 12 valve NV4500 4x4 LB club cab autometer boost and pyro BrentBilt fuel plate full forward silencer ring MIA straight pipe AFC totally maxed out
1977 GMC high sierra 6500 2WD with 366V8 and 5+2 speed trans
1968 Mercury (The Tank) M-100 2WD with 300 I-6 and 3 on the tree trans
1971 John Deere 4320 with a 404CID With A Factory Shwitzer 3LD turbocharger Crankin 116 horsepower with over 9700 origininal hours on the engine never rebuilt!
1978 John Deere 8630 with a reman 619 CID Diesel out of a 8650 With A Factory Aireasearch TV-6102 turbocharger Crankin 320 Horsepower and 1700 torque
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your wrong brent, i'll think of a reason later

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brent can't do that, it would look factory, lol

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Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
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Old 11-03-2009, 06:48 PM   #5 (permalink)
jdemaris
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Quote:
Originally Posted by JLanzino View Post
Hi Guys Over The Years I`ve Heard Both Sides and Was Wondering Which of The Two Engines (6.2 vs 6.5) is Really The Better One.

Thanks Guys

JL
Not all 6.2s are the same, nor are all 6.5s. Probably one of the strongest blocks ever made are the ones that both the 6.2s and 6.5s used in 1992, casting #10149599 . Since the 6.2 version has a smaller piston bore, the cylinder wall is heavier and more rugged. So, depends on how you want to look at it. The 6.2 version is more rugged, and the 6.5 version has more power.

Ford had the same thing going on with their IH 6.9s and 7.3s. Same engines with different bores. The 6.9s are more resistant to cyliinder-wall corrosion because they are thicker.
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1982 K10 PU 6.2 diesel,1983 (two) Blazers 6.2 diesel, TH400, 1983 K5 Blazer with 6.2 diesel, 4sp man. OD trans. and Chalet pop-up camper body.
1986 K5 Blazer 6.2 diesel, 700R4 trans.- with Halmark pop-up camper body.
1987 V20 4WD Suburban 6.2 diesel, 1988 K5 Blazer 6.2 diesel, 700R4. 1989 GMC 3/4 ton, 4WD Suburban, 6.2 diesel, TH400 trans.
1991 Suburban 4WD 6.2 diesel 700R4 trans.
1981 (two of them) Chevy Chevette with 1.8 diesel and 5 sp. trans.
1985 Isuzu P'UP 4WD pickup with 2.2 diesel
1991 (Two of them) Volkswagen Jetta 1.6 diesel
1985 Ford F250 4WD ex-cab, longbed, 6.9 diesel
1994 Ford F250 4WD ex-cab, longbed, 7.3 IDI turbodiesel.
1983 Mercedes 300D five-cylinder turbo-diesel
1992 Dodge D200 4WD Cummins turbo-diesel, intercooled with 5 spd Gertrag
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Old 11-03-2009, 06:49 PM   #6 (permalink)
4320Diesel
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what about the redblock 6.2's?
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1995 Dodge 2500 Cummins 12 valve NV4500 4x4 LB club cab autometer boost and pyro BrentBilt fuel plate full forward silencer ring MIA straight pipe AFC totally maxed out
1977 GMC high sierra 6500 2WD with 366V8 and 5+2 speed trans
1968 Mercury (The Tank) M-100 2WD with 300 I-6 and 3 on the tree trans
1971 John Deere 4320 with a 404CID With A Factory Shwitzer 3LD turbocharger Crankin 116 horsepower with over 9700 origininal hours on the engine never rebuilt!
1978 John Deere 8630 with a reman 619 CID Diesel out of a 8650 With A Factory Aireasearch TV-6102 turbocharger Crankin 320 Horsepower and 1700 torque
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

Quote:
Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

Quote:
Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
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Old 11-03-2009, 06:54 PM   #7 (permalink)
Wa_rWagon
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6.5 Turbo hands down. Has decent power and no smoke. (same 200HP, 1993, as a 1995 5.7 gas and more TQ.) The 6.2 without a turbo in a 1500 suburban can’t get out of it’s own way and will roll the coal factory like the new diesel guys wish they could. (and have to spend money to do so.) Only the 5.7 olds diesel smoked worse.
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Old 11-03-2009, 07:02 PM   #8 (permalink)
jdemaris
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what about the redblock 6.2's?
The 1982 engines had a lot of problems other then the block. Head gaskets leaked something awful (needed an update from GM), valves too big causing cracking, injector pumps with short lives due to the plastic governor rings falling apart (eliminated in 1985), etc. For those reasons, as well as the 700R4s failing often, many of those early 6.2 rigs got parked with low miles. So, I'm not sure if they were actually better or not.

I've got three of those engines sitting under my work-bench. All with less then 50K miles. I did a spark-test with a grinder, and the metal on the blocks makes sparks a different color than later blocks. So, I assume the alloy is different somehow. The theory is it has more nickel content, just like the new 6.5s being made now have.

With the 1992 engines, in 6.2 or 6.5 version, they pretty much had the best of everything. Different crank, block, injection pump, heads, etc.
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1982 K10 PU 6.2 diesel,1983 (two) Blazers 6.2 diesel, TH400, 1983 K5 Blazer with 6.2 diesel, 4sp man. OD trans. and Chalet pop-up camper body.
1986 K5 Blazer 6.2 diesel, 700R4 trans.- with Halmark pop-up camper body.
1987 V20 4WD Suburban 6.2 diesel, 1988 K5 Blazer 6.2 diesel, 700R4. 1989 GMC 3/4 ton, 4WD Suburban, 6.2 diesel, TH400 trans.
1991 Suburban 4WD 6.2 diesel 700R4 trans.
1981 (two of them) Chevy Chevette with 1.8 diesel and 5 sp. trans.
1985 Isuzu P'UP 4WD pickup with 2.2 diesel
1991 (Two of them) Volkswagen Jetta 1.6 diesel
1985 Ford F250 4WD ex-cab, longbed, 6.9 diesel
1994 Ford F250 4WD ex-cab, longbed, 7.3 IDI turbodiesel.
1983 Mercedes 300D five-cylinder turbo-diesel
1992 Dodge D200 4WD Cummins turbo-diesel, intercooled with 5 spd Gertrag
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Old 11-03-2009, 07:08 PM   #9 (permalink)
meb727
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Quote:
Originally Posted by jdemaris View Post
The 1982 engines had a lot of problems other then the block. Head gaskets leaked something awful (needed an update from GM), valves too big causing cracking, injector pumps with short lives due to the plastic governor rings falling apart (eliminated in 1985), etc. For those reasons, as well as the 700R4s failing often, many of those early 6.2 rigs got parked with low miles. So, I'm not sure if they were actually better or not.

I've got three of those engines sitting under my work-bench. All with less then 50K miles. I did a spark-test with a grinder, and the metal on the blocks makes sparks a different color than later blocks. So, I assume the alloy is different somehow. The theory is it has more nickel content, just like the new 6.5s being made now have.

With the 1992 engines, in 6.2 or 6.5 version, they pretty much had the best of everything. Different crank, block, injection pump, heads, etc.
The '93 6.2s are #599 blocks as well, and the advantage of the '92-'93 6.2 blocks is that you can put the NEW FORGED 6.5 cranks in them, eliminating the (IMHO) #1 weakness of these motors-premature & unpredictable crankshaft failure, usually with little or no warning. The '82 red blocks would probably be decent as well, but the heads were weak, and you'd be forced to use a used crank for them (due to the 2-piece rear main design).
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06 Dodge Ram 3500 SRW MegaCab CTD 4X4 48RE
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Old 11-03-2009, 07:09 PM   #10 (permalink)
4320Diesel
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yea a 599 block 6.2 is in my future when i build up a good power 6.2
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1995 Dodge 2500 Cummins 12 valve NV4500 4x4 LB club cab autometer boost and pyro BrentBilt fuel plate full forward silencer ring MIA straight pipe AFC totally maxed out
1977 GMC high sierra 6500 2WD with 366V8 and 5+2 speed trans
1968 Mercury (The Tank) M-100 2WD with 300 I-6 and 3 on the tree trans
1971 John Deere 4320 with a 404CID With A Factory Shwitzer 3LD turbocharger Crankin 116 horsepower with over 9700 origininal hours on the engine never rebuilt!
1978 John Deere 8630 with a reman 619 CID Diesel out of a 8650 With A Factory Aireasearch TV-6102 turbocharger Crankin 320 Horsepower and 1700 torque
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

Quote:
Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

Quote:
Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
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