throttle body

[bince]

Hello

Ok so i was wondering if i should get a new holly throttle body for my 90 c1500 or just rebuild my stock one. The reason i ask this is because the holley throttle body claims that i could get 25% more horsepower but i don't know if this number is realistic. Or if i should just go with my existing stock throttle body.

please respond soon because there is one for a good price on ebay.

thank you

[2000CAYukon]

Originally Posted by bince

Hello

Ok so i was wondering if i should get a new holly throttle body for my 90 c1500 or just rebuild my stock one. The reason i ask this is because the holley throttle body claims that i could get 25% more horsepower but i don't know if this number is realistic. Or if i should just go with my existing stock throttle body.

please respond soon because there is one for a good price on ebay.

thank you

Last time I looked, Holley did not sell a new TB for 1990. 25% more horsepower without any other changes seems unrealistic to me.

If you are looking to improve your stock unit, take a look at www.turbocity.com They sell upgraded TBs.

//2000CAYukon

[bince]

they do make one for th3 90 its model # 502-9 and that is what holley claims 25% i know that seems unreal. But i was wondering if i just cleaned mine out would it work just as good as an upgradeed tbi

[2000CAYukon]

Originally Posted by bince

they do make one for th3 90 its model # 502-9 and that is what holley claims 25% i know that seems unreal. But i was wondering if i just cleaned mine out would it work just as good as an upgradeed tbi

Unless you upgrade cam/heads/exhaust, the stock unit should be fine. My 90 K1500 has 110K on the clock and still runs well with the stock TBI unit.

a/c delco does sell a gasket kit if you decide to rebuild yours. I think I paid $40 for the kit (have not rebuilt mine yet but was planning to later this year). I also spray clean mine every now and then with TB Cleaner.

//2000CAYukon

[J-Ri]

I think (I didn't look into it at all) the power gains they claim are probably from built-in throttle body and fuel injector spacers. You could probably get those for about what shipping would cost on the new unit.

[tirefryer93]

bince, do yourself a big favor and try to get your hands on a holley # 502-6. Sure, they SAY it's only made for 87-89 350s, but it will work through 91, depending on the truck. The only difference in the 350s from 87-95 (for the most part) is the TPS hookup. Your 1990 will bolt right in, and you will be happy. Hmmm, O.E.M (450 cfm, 55# injectors) or Holley (670 cfm, 68# injectors) Have fun!

[v10_viper]

Originally Posted by tirefryer93

bince, do yourself a big favor and try to get your hands on a holley # 502-6. Sure, they SAY it's only made for 87-89 350s, but it will work through 91, depending on the truck. The only difference in the 350s from 87-95 (for the most part) is the TPS hookup. Your 1990 will bolt right in, and you will be happy. Hmmm, O.E.M (450 cfm, 55# injectors) or Holley (670 cfm, 68# injectors) Have fun!

Would a person be able to change the hookup of the TPS to work for a 92 Silverado? Because I was really looking into the TB to, figured it would complement straight exhaust and a freer flowing intake quite well because of the added airflow. Why don't they make ones that'll work for all of the 88-98 CK's?

[tirefryer93]

You know, I don't know why Holley doesn't just put the newer style TPS on their 670 cfm throttle body and make tons of more people happy. Nevertheless, I just got back from a junkyard, I got a TPS clip from the wiring harness of a 4.3 TBI in a caprice. The basic wiring is the same whether it's a 4.3, 305, or 350, so I just bought it for five bucks! Now all I need to do is splice it into my harness using the three wires that are there. I think they're even color coded: Gray, Black, and Blue, I think. So I'll do that if it ever cools down today, and I'll keep everyone informed. I think people have done this before...