71 GMC engine swap-arino

[Kalums]

Anyone know the "tall" Acdelco water pump part # all the websites Ive tried keep telling me it is supposed to be "short" but my current one has a 2 belt pulley and 3 on the crank.. maybe had a smog air pump at one point... Idk, thanks in advance.

Also will there be a problem in the TBI 350 with the back 2 water ports in the head being blocked by the Intake manifold? I don't see a crossover in any of the rear parts of a Carb intake (I think because of the HEI) ideas?

[MARKDTN]

Need a photo of your current water pump installed. Delco 252-595 is a square body long pump so pulleys should be easy to source.

I don't see any issues with blocking those back ports with the intake. The Q-jet intakes used on those longblocks in the last carbureted Caprices only cross in the front.

[Kalums]

Originally Posted by MARKDTN

Need a photo of your current water pump installed. Delco 252-595 is a square body long pump so pulleys should be easy to source.

I don't see any issues with blocking those back ports with the intake. The Q-jet intakes used on those longblocks in the last carbureted Caprices only cross in the front.

Ask and ye shall receive

[MARKDTN]

Looks like a short pump to me? 3rd groove is for A/C.

https://67-72chevytrucks.com/vboard/...d.php?t=729685
See post 19

[Kalums]

Originally Posted by MARKDTN

Looks like a short pump to me? 3rd groove is for A/C.

https://67-72chevytrucks.com/vboard/...d.php?t=729685
See post 19

I thought the long shaft pump was roughly 7 inches from the mating surface(block) to the fan mounting surface... That is what mine is... You tell me *shrugs*

[MARKDTN]

Short water pump is almost touching the timing cover and the lower pulley is flat.

Long water pump there is a roughly 1" gap to the timing cover and the lower pulley has an offset away from the balancer.

I would agree that the upper pulley looks odd for a short pump, perhaps there is a spacer between the pump and pulley?

Also I have never seen a factory LH alternator mount for a long pump.

[Kalums]

Originally Posted by MARKDTN

Short water pump is almost touching the timing cover and the lower pulley is flat.

Long water pump there is a roughly 1" gap to the timing cover and the lower pulley has an offset away from the balancer.

I would agree that the upper pulley looks odd for a short pump, perhaps there is a spacer between the pump and pulley?

Also I have never seen a factory LH alternator mount for a long pump.

This is why it got the name "Frankie" it was Frankensteined by one or more previous owners... *facepalm* I will check the gap in a minute thx for that info

[weq92f]

.

If you go with that salvage yard serpentine system posted earlier, you can do away with that pancake compressor with these brackets. They allow using a robust Sanden 508 compressor in its place...

https://www.dirtydingo.com/shop/prod...oducts_id=1622

These brackets only work on the small block, GM aluminum serpentine system.


-Kevin

[Kalums]

Originally Posted by weq92f

.

If you go with that salvage yard serpentine system posted earlier, you can do away with that pancake compressor with these brackets. They allow using a robust Sanden 508 compressor in its place...

https://www.dirtydingo.com/shop/prod...oducts_id=1622

These brackets only work on the small block, GM aluminum serpentine system.


-Kevin

Nice! Thank you for the link.

[Kalums]

Originally Posted by MARKDTN

Short water pump is almost touching the timing cover and the lower pulley is flat.

Long water pump there is a roughly 1" gap to the timing cover and the lower pulley has an offset away from the balancer.

I would agree that the upper pulley looks odd for a short pump, perhaps there is a spacer between the pump and pulley?

Also I have never seen a factory LH alternator mount for a long pump.

Originally Posted by MARKDTN

Short water pump is almost touching the timing cover and the lower pulley is flat.

Long water pump there is a roughly 1" gap to the timing cover and the lower pulley has an offset away from the balancer.

I would agree that the upper pulley looks odd for a short pump, perhaps there is a spacer between the pump and pulley?

Also I have never seen a factory LH alternator mount for a long pump.

So here is what I got... The current pump is literally touching the timing cover.. And the block to pump distance is 1" almost exactly. Where the new 252-595 "long" pump is 1.5" leg length roughly but the fan has about a 3" gap between the fan and radiator and hangs out of the shroud by about 1/2-3/4". I'm wondering if it was a Frankensteined rebuilt WP... that bubba's cousin rebuilt as a "favor". The over all height is only off by what looks like 1/16"...*shrugs* Also for some reason I just noticed I have a 2 belt on the WP and a 2 belt on the crank with a gap where the "2nd" belt for A/C would normally be.

[Kalums]

Not going to lie... This is becoming a headache.... *facepalm*

[slikside]

Hang in there, man. Step away, take a break, come back with fresh eyes and thoughts.
You'll get r dun!

[Kalums]

Originally Posted by slikside

Hang in there, man. Step away, take a break, come back with fresh eyes and thoughts.
You'll get r dun!

Thank you for the encouragement, took me two months to firgure out the rear axle and drum brakes... I know there are ppl on here who have been wrenching on one truck for years. I was just hoping to have this swap done by early February... But it isn't looking like that is going to happen... *sighs* Every one in here is being amazing help, don't get me wrong, I just don't understand why ppl(the previous owners) do such hack job bull. I've always been of the mindset do it right and do your best, the first time.

[Kalums]

I really appreciate those of you who are helping me out and answering all my incessant questions... Well it turns out I have no idea where/ how I measured the existing water pump... Apparently I may have been 90% asleep *facepalm* I went back and measured everything one more time... I do have a short shaft pump currently. All of the other observations I was making about the fan, the fan cowl and radiator... Is because all of those items had shifted and were not where they belonged. The radiator wasn't even in the bottom channel/brackets which pushed the bottom of everything else sideways and back... The whole setup was twisted kinda like a potato chip... But it wasn't noticeable from the topside(unless you were actively looking for it). Either way new measurements are exact for a short shaft, and I will be getting a 3 belt crank pulley for the new engine so eventually I can slap a vintage air system in this originally non-air conditioned truck. Oh and the long pump goes back in the morning.

[Kalums]

Anyone know the "short" ACdelco water pump part number? I keep getting 252-581 but alot of sites say it is a "reverse rotation".... Not sure if that means counter clockwise rotation or reverse flow? I'm so confused

[Steeveedee]

You might want to go with the serpentine system at this time, because it has a reverse rotation water pump. You'll have to replace whatever pump is on the engine when you make the change over.

[Kalums]

Originally Posted by Steeveedee

You might want to go with the serpentine system at this time, because it has a reverse rotation water pump. You'll have to replace whatever pump is on the engine when you make the change over.

I want to... But the cost is killing me, to swap to serpentine would cost at least 325 for the brackets + a new Alternator +either an A/C compressor or the pulley to go in it's place... Which the $$$ varies widely... So I want to but... The cost is crazy. Where if I just put the V-belt system back on for now I can get it running and save for the serpentine and/or Vintage air system.

[Kalums]

No real updates today lubed up the rocker arms, push rods, springs, lifters/seats, cam to distributor worm gear, timing chain and the few cam lobes I can get at from the engine valley with a hand oiler full of assembly lube. Pretty much any thing I know that moves during engine operation and could get to with the spout of the hand oiler. Other than that had to send back the amazon intake, it had no markings on it anywhere and it was supposed to an Edelbrock 2104...what I got was a square bore... They are supposed to exchange it, we will see how that plays out. But most of the day was spent with the minion.

[jaros44sr]

Have you checked the metalergies of the distributor gear and the camshaft pretty sure reman people would have figured that out

[Kalums]

Originally Posted by jaros44sr

Have you checked the metalergies of the distributor gear and the camshaft pretty sure reman people would have figured that out

Not exactly sure what you are referring to the "metalergies"? If you are asking if the 2 mesh they seem to well, I've got an MSD "Flamethrower" HEI, but I'm going to swap over all The stock GM/Delco internals from my old distributor. I got it "open box" and only wanted the main shaft/stem. Oh and they both appear to be black oxide coated metal?