What SBC engines used a long water pump with the low/right heater hose connection, instead of the customary top/angled heater hose return? I've seen them somewhere, but can't recall what model/year.

I have a special installation which needs one. Any clues?

I know Holley has pumps that are long or short. But I think there talking about the neck and not a whole different style. But maybe.

There were two basic variants of SBC pumps (not counting the reverse-rotation pumps) - Long and short. AFAIK, short shaft/housing pumps were used originally on all SBCs, and later were continued on Corvettes and some trucks. Most passenger engines got long-shaft pumps around 1964 IIRC to get the fan closer to the radiator and make more space for more belts and accesories.

My question is what long shaft/housing pumps had the low/side heater hose return connection, if any? Most long pumps have the top/angled connection, but I seem to recall seeing long pumps with side connections somewhere. Perhaps I'm dreaming.

I honestly don't remember seeing any long-neck water pumps with the side angle heater connection - I've only seen that on the short-neck ones.

FWIW, I believe the long-neck pumps made their debut around the time of the cylinder head accessory bolt holes, around '68 - '69.

You're probably right about the debut years for the long water pumps. The '60s are somewhat of a blur in my mind...

69 and up on all cars cept corvette got the long pump, corvette used the short pump through 74 or 75 or maybe 76

all the trucks got the long pump for 73-up, same year as the new body style change and engine mount and exhaust manifolds change and minor chassis changes such as trans crossmember and such

and the big HD trucks got waterpumps with extra ports and probably the one with the port you are thinking of

cylinder head bolt holes existed lonnnnnng before 68, pop the hood on any 63-67 chevy truck witha sbc in it and youll see that there are holes in the heads,

68 was the year that the temp sender moved to the cylinder head and out of the intake and also the same year the pcv system was required

this is all basic sbc 101 knowledge that everyone should know, but doesnt

cylinder head bolt holes existed lonnnnnng before 68, pop the hood on any 63-67 chevy truck witha sbc in it and youll see that there are holes in the heads

this is all basic sbc 101 knowledge that everyone should know, but doesnt

Sorry.

Trucks '69-up, just like cars, have head bracket provisions. None before, unless the engine was replaced at one point. My friend had a '67 Chevy 1/2 ton, so I am very familiar with this.