carb tune-up
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Elder User
Joined: May 2007
Posts: 548
Likes: 0
From: Sparks, NV
carb tune-up
hey its me again asking for s'more help 
.
1: what jets came with a stock/sea level holley 4160 #6919?
2: what jets should i be using at an elevation at about 4000-5000 ft higher than sea level?
3: how can you tell if a power valve is broken
4: i tuned my carbs idle screws with a dwell/rpm meter. is that right?
5: around hat range will my floats be set at?
6: how do i adjust the secondaries in general?
7: will a vacuum gauge help or would the rpm meter be suffice?
THANK YOU in advance my truck is almost ready for smog, just gotta tune that carb
.1: what jets came with a stock/sea level holley 4160 #6919?
2: what jets should i be using at an elevation at about 4000-5000 ft higher than sea level?
3: how can you tell if a power valve is broken
4: i tuned my carbs idle screws with a dwell/rpm meter. is that right?
5: around hat range will my floats be set at?
6: how do i adjust the secondaries in general?
7: will a vacuum gauge help or would the rpm meter be suffice?
THANK YOU in advance my truck is almost ready for smog, just gotta tune that carb
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
Your carb came with 122-622 main jets, a blk secondary spring, power valve 125-206. A blown power valve causes excess gas. If your carb doesn't have blowout protection added then it could very well be blown.
The rule of thumb is one jet size down per 2000 ft. But you have to play with that in most cases. Adjusting secondaries is done with changing springs. Parts & kits are available from Jegs or Summit at a good price.
The rule of thumb is one jet size down per 2000 ft. But you have to play with that in most cases. Adjusting secondaries is done with changing springs. Parts & kits are available from Jegs or Summit at a good price.
