# i have 2 SBC questions having to deal with HP

**URL:** <https://forums.speedlife.net/t/i-have-2-sbc-questions-having-to-deal-with-hp/187560>\
**Category:** PittSpeed Automotive\
**Created:** [January 21, 2007, 7:11pm UTC](https://forums.speedlife.net/t/i-have-2-sbc-questions-having-to-deal-with-hp/187560 "2007-01-21T19:11:54Z")\
**Posts on this page:** 1\
**Showing post:** 39

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**Author:** ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)\
**Post date:** [January 23, 2007, 6:35pm UTC](https://forums.speedlife.net/t/i-have-2-sbc-questions-having-to-deal-with-hp/187560/39 "2007-01-23T18:35:25Z")

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> [@Quest For The CUP! Rd.1 Game .1](https://forums.speedlife.net/t/quest-for-the-cup-rd-1-game-1/27515/38):
>
> single plane intake, i DID try another carb (holley 750cfm) but it needed rebuilt, but it did do the same thing, which makes me believe it has to be a vacuum leak, or something… I was also thinking it may be a weak ignition, but i couldnt find anything for real cheap.
> 
> im not sure, but i do know it was within specs of the cam it has.
> 
> the car will run with the idle mixture screws turned in all of the way, which tells me it is bypassing the idle circuit on the carb

you need to know what the vaccumm is. it helps when adjusting the idle mixture screws, alos, if your only pulling let’s say 5" of of vacuum, and your powervalve is 6.5, then youre drawing extra fuel in.

are the floats set right?

what is timing set at initial and total?

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