I am going to get a stewart water pump for my 400sb but not sure whether to get short or long for my application. Can someone enlighten me?

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91 Firebird 305/TBI - cam:.420/.442 204/214 - Hooker 1 5/8" headers - TFX PaceSetter Cat-Back - 3.42's Auburn Pro Posi - ASCD Ram-Air hood - Polished Formula Wheels w/Futura's - Open element - .5" Corian TB spacer - Lakewood LCA's - Hotchkis Lowering Springs - KYB Struts/Shocks - 14.78 @ 97.5 mph(G-Tech) - MacEwen MotorSports Whiteface Overlays - 412ci sb waiting to go in this spring.
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Long. Get the one that fits your car. The block is the same externally, the accesories don't care what the bore and stroke are.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I like to run the short waterpumps because I always see a much better selection of models to choose from in short-style. If the model you want is a short style then you just need the Moroso extension-block kit to space it back out like the long pump. It's just two aluminum blocks and longer bolts... no problem.
I always run the short pumps with spacers.

good luck

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White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, single 3" Borla exhaust, Linginfelter-TPI camshaft pulls 17" vacuum solid. N/A runs 10.9 @124, Crack-runs 10.3 @135... haven't run at track since Oct-99

 

GM stopped using short water pumps somewhere around 1969. The trouble with using one now is that all the accessories typically will bolt to the pump. Short pumps don't come with accessory mounting points while the long ones do.

I used a short pump on my big block installation. No power steering, no smog pump, no AC, electric water pump drive. I fabricated an alternator bracket to mount the alternator down low on the passenger side.

If you still have all those accessories then I'd recommend a long pump unless you're willing to fabricate mounting brackets.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

The short style pump was mainly used on Corvettes and some 68 and older Chevy cars and trucks. You can use the short style if you get the spacer kit along with it, but make sure it also has mounting bosses on it for your alternator bracket.

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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

 

Yeah he's right, sorry
I forgot some of you still run accessories.
my bad



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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, .462/.470 lift @1.5:1 ratio. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch.
N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99

 

Thanks for the info. I purchased a Stewart Stage 1 Long style.

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91 Firebird 305/TBI - cam:.420/.442 204/214 - Hooker 1 5/8" headers - TFX PaceSetter Cat-Back - 3.42's Auburn Pro Posi - ASCD Ram-Air hood - Polished Formula Wheels w/Futura's - Open element - .5" Corian TB spacer - Lakewood LCA's - Hotchkis Lowering Springs - KYB Struts/Shocks - 14.78 @ 97.5 mph(G-Tech) - MacEwen MotorSports Whiteface Overlays - 412ci sb waiting to go in this spring.
My Homepage