12

Water Pump Underdrive Pulley

SKU: ZZ-WTRPUNDPUL

$69.99

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Dyno testing our 5.5" underdrive pulley on a near stock L36 showed 3WHP gained at 6k rpm. In car testing shows only a 2 deg increase in operating temps over stock. Higher gains are possible depending on your engine combination. Pulleys are available in a high gloss black anodized finish.

  • 8% underdriven
  • dyno proven horsepower
  • lightweight design saves a pound of rotating mass
  • increases water pump life expectancy
  • better fuel economy

One size larger than stock belt recommended.

Does NOT fit HBody cars because of their front engine mount. Bonneville, Park Ave, & LaSabre.

 

Water pump pulley: 115 in/lbs.

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Dyno testing our 5.5" underdrive pulley on a near stock L36 showed 3WHP gained at 6k rpm. In car testing shows only a 2 deg increase in operating temps over stock. Higher gains are possible depending on your engine combination. Pulleys are available in a high gloss black anodized finish.

  • 8% underdriven
  • dyno proven horsepower
  • lightweight design saves a pound of rotating mass
  • increases water pump life expectancy
  • better fuel economy

One size larger than stock belt recommended.

Does NOT fit HBody cars because of their front engine mount. Bonneville, Park Ave, & LaSabre.

 

Water pump pulley: 115 in/lbs.

Customer Reviews

4.8 Based on 12 Reviews
5 ★
83% 
10
4 ★
17% 
2
3 ★
0% 
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2 ★
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JT
05/17/2019
Joshua T.

Easy first mod

Easy install for quick gain in hp I’d recommend a lower degree thermostat and make sure you order the proper belt size

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OJ
06/07/2018
Osiel J.

Pulley slaps right in a

Pulley slaps right in a lot lighter then OEM product. Noticed different idle and faster throttle response would definitely recommend one of these bad boys

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DS
12/11/2017
David S.

Underdrive water pump pulley

Very light weight when compared to stock pulley! Only needed to go 1/2 inch bigger in belt size. Idle has improved as well as revs and slight pull when accelerating. Didn’t get 5*s because it had some couple jagged edges where the belt lays that needed to be ground down, but it a very nice item.

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JN
11/04/2016
Jason N.

Water pump under drive pulley

Great product light weight. The car response is much better now. A mod that truly works and only takes 15 mins to install. Didn't notice a increase in temp at all.

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JG
03/23/2016
James G.

Very easy install, works great

Very fast shipping along with the other pulleys I ordered. Very easy install, about 10 mins total doing the alt under drive pulley and 3.5" idler pulley. Noticed a very small increase in coolant temp but nothing major.

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