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1990 SUBURBAN V2500 LH Exhaust Manifold Question

T

TrustySub

1984 & 1990 3/4T, 4X4 Suburbans
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South Coast of Oregon
The 1990 Suburban came with the 6.2 and used GM 14022657 for the driver side (LH) manifold.

Question: Since I'm converting to a 6.5 turbo manifold, do I use the original design for the 6.2 OR can I upgrade to the GM 12557359 for 1993 and newer??? I can't quite tell with everything out of the truck for the time being...

The difference is in the dump: the older is more straight down versus a downward angle.
6.2 driver side exhaust manifold.jpg6.5 driver side exhaust manifold.jpg

THANKS for any advise you may be able to offer!!!
 
Last edited by a moderator:
I'm doing a similiar project - 85 1 ton with a 6.2/Banks . You have 4wd and that means a different crossover pipe . I also have the 6.5 manifold , using this means another crossover pipe as the oil cooling holes are very close to the manifold . I have some hydraulic hose ends and was going to see if they would work . Can't use the 6.2 oil lines with the 6.5 manifold . I pretty sure the opening for the 6.5 manifold was 2 3/8" so that's something to think about . Either way , you need to find a 4wd crossover or make one .
 
EWC said:
I'm doing a similiar project - 85 1 ton with a 6.2/Banks . You have 4wd and that means a different crossover pipe . I also have the 6.5 manifold , using this means another crossover pipe as the oil cooling holes are very close to the manifold . I have some hydraulic hose ends and was going to see if they would work . Can't use the 6.2 oil lines with the 6.5 manifold . I pretty sure the opening for the 6.5 manifold was 2 3/8" so that's something to think about . Either way , you need to find a 4wd crossover or make one .
Click to expand...

I'm running into this same problem converting a 6.2 to turbocharged power...have the 6.5 turbo manifolds and the driver's side won't mount up unless the factory oil cooler lines are done away with. I also have the clutch slave cylinder pressure line there too and it will be in the way too by the time the crossover pipe is mounted. Going to have to make a set of oil cooler lines that will connect to the fittings at the rear leftside of the block and make another clutch line bent around the driver's side manifold. I'm determined though...because I want to have a turbo!
 
BANKS tech says their kit is designed around the 6.2 therefore, I must use 6.2 exhaust manifold. That should help you other guys too.

So, it looks like I still need the correct water pump plate for a serpentine setup - can anyone help - please???

Got clear weather to finish touchup paint in engine compartment & chassis. Got my 400 rebuilt and 241 inspected. Not sure about the 241 even tho the local tranny guy says he never saw one that didn't have some play in it. I had a 208 rebuilt in Portland and that case has ZERO play - no matter what pattern it shifts to. If any expert on here can say a 241 can't be built with zero play - PLEASE speak up.
 
i rebuilt a motor for a friend awhile back its a 6.2 short block with 6.5 heads, manifolds and turbo. i used the 6.5 manifolds and the oil cooler lines from the 6.5. there wern't clerance issues. it was in a 97 suburban 4x4
 
Not to sound ungrateful, but anything newer than '95 (?) kinda falls outside the specifications for the old-style Suburbans. The bigger issues being the size of the A/C protruding from the firewall and the 4x4 frame bracing and straight axle (all room or clearance issues).

As for the water pump backing plate...my research (using NalleyGMC website) is starting to reveal that all of the various applications utilized the same part number plate! From early 6.2 thru 6.5 in 1998, I keep seeing GM# 12562659. Serpentine or not, they all appear to be the same water pump backing plate.
I read somewhere (wish I remembered where now) that serpentine setups that utilize reverse flow water pumps require a different plate. Can someone please confirm or deny my findings? IT would be soooooo appreciated!!!!!!!


Shot of firewall after placing Dynamat plus heatshield to keep OEM from breaking apart any further!
firewall heat shield.jpg
Thanks for the feedback folks.
 
Water pump plates:

12562637 is the number for up to around 1991 in most applications, I assume with v belts; 12562659 is used for around 1991 and newer 6.2 and 6.5, again I assume that one is for serpentine belt setups.
 
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