Posted by CenTex Farmall on January 26, 2019 at 19:55:04 from (107.242.113.1):
In Reply to: ot, old chevy experts posted by ericlb on January 26, 2019 at 11:03:54:
Any more the auto parts stores have all kinds of screwy things in their books and computers.
There's a short pump and a long pump for Big Block. There's also a pump that has an extra water outlet on it for some special applications. That may be what they have tagged as "High Performance". There's higher flowing designs where they basically added what looks like a large washer over the end of the impeller vanes to make the pump more efficient. This is what you want for low speed towing and such. The counter people most likely don't know the difference and you have to take the back cover off to see if that's what it is.
A tall intake is no guarantee that it has rectangular port heads or is special anything. All the earlier manifolds were taller, both rectangle and oval port. I have a couple of the tall oval port cast iron intakes. One of them is on my '81 one ton. The shorter manifolds came out for lower hood lines and then they just made those from about 70 onward and put them in cars and pickups.
Is there any chance that someone stuck a tall deck truck motor in there? By "Truck" I mean the 366 and 427 that came in medium duty trucks (C60, C70 etc.). On standard height blocks the top of the upper water pump mounting hole is almost flush with the top of the deck. The truck version has .400 taller decks and you can see this much space above the upper water pump mounting bolts. The truck motor has taller pistons with 4 rings.
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