El Camino Central Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
63 Posts
Discussion Starter #1
I have a 600 cfm 4160 Holley Carburetor on my 75 Sprint the engine is a 350. It always has had a slight hesitation when accelerating. Took it to a shop and they worked on the timing and fixed some issues with the carb. When I paid the bill he said it needs a 10.5 power valve in it and that would take care of the hesitation. Was wondering if this sounds correct or not.
 

·
Registered
Joined
·
209 Posts
Holley's website describes what the power valve does and how you determine which one. Seems you take a vacuum reading at idle (in gear with auto trans) and whatever the reading is, divide it in half and that's the power valve you need. I just installed a new Holley 4150 on my 350 (last night) and haven't yet even road tested it, I'll be interested in what you determine.

 

·
Registered
Joined
·
11,853 Posts
is this a winter time problem??
depending on your location,
the carb tune will change
or need to be changed a little with the weather..
.
check the vacuum at idle and part-throttle/ cruise..
.
I thought this question sounded familiar..
 
1 - 3 of 3 Posts
Top