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What about the slotted style holes in the pump housing? Can I rotate the pump and advance it that way?

The transfer pump, is that the same thing as the lift pump? I know on my 12 valve its on the block where is it on the 6.5?

So is adjusting that fuel screw underneath the access plate the only way to turn up the pump without internal modifications?

Well I just picked up a recently rebuilt 4911 with lines and a GM3 turbo for 150 bucks. This seems to be the pump to hot rod and now that I have an extra turbo I might just have to run compounds. No good to me sitting on the shop floor.

Just wondering which one of the DB2831 would be the better ones.

I found one on ebay but it just says DB2/4911, no 8XX though. Seems sketchy. My buddy is a supply sergeant, I'm gonna see if he can snag me a HMMWV one. Should work since they never went to the DS series. This is what I found: 2910-01-434-8597 DB2831-5079 6.5 Turbo (1996 &1997) 4L80-E...

Ok so I'm picking up a 97 F code 6.5 this week for 100 bucks minus the ds4 pump. The guy blew a HG and swapped in a 12v. So I'm now in the market for a pump. Do all the 4911 pumps have the .310 plungers or do some have the .290? Where do I find the 8XX numbers on the pump?

I know this is an older thread but I was looking at the twin DB pumps in that video clip, it looks like they just pump into a long vertical T block. Is that doubling the pressure or the volume or both? It looks pretty neat I'm just trying to wrap my head around its function and practicality.

What applications where these GM pumps found in?

I appreciate the info on where to get new ones and all but I personally would rather find out exactly how they work and mod it myself, i really wish i could find that info about using 7.3 parts

Can I use parts out of a DS4 in a DB2? Like the plungers? The Head? or am I out in left field?

I would rather find a couple used DB2s and pull em apart and tinker with them and build my own that shell out almost a grand for a pump. Thats why I want to find some more info on them and the ones used in other applications like Ford or John Deere, I'm not sure what else they came in or what...

The project is an 86 K20 12" lift D60 front/14FF rear 4.10s and the biggest tires I can cram under it without having to cut the cab Yes I am replacing the engine, it has a SBC 350 now, as for a turbo I was leaning towards one off a cummins (H1C,HX30,HY30) not sure which yet, haven't got that...

So J code heads with diamond precups is my best option then? There are no other advantages of the 6.5 heads? And for the lines can I just run 6.5 lines or am I missing what you are saying?

Hey guys, I have been poking around here and some other sites for a while now trying to gather up some info on a build I'm doing for my gf. The truck its going in is a 86 K20 currently a 350/TH400 and I have a 12" spring lift for it so most clearance problems wont be an issue. From what I...