Carb/prop issue

J

jay127

Seaman Apprentice
Joined
May 17, 2010
Messages
47
Vortec 4.3 w /holley 4160 4 barrel.

The boat runs great but here's the issue. If I use one spring in the carburetor I get a good take off with a top speed of 47. 4 barrels don't open as enough. Now if I put the spring in that allows it to open sooner I get bad bogging cause the 4 barrels open to soon but once it plains the boat screams to 51mph. is there anyway that people have found to solve this issue.

Thanks and sorry if its confusing
 
Boomyal

Boomyal

Supreme Mariner
Joined
Aug 16, 2003
Messages
12,072
Re: Carb/prop issue

Maybe the secondary jets are too big for the motor. Did the 4160 come with the motor originally? 4160's come jetted from Holley for all kinds of small to intermediate block motors. Another thing to consider, does it have the right powervalve in it? You can usually call Holley, give them the list # and they can tell you what it was set up for and might point you in the direction to find info what would work best for your motor.

Have you ever shut down rapidly after a high speed run and taken a reading on the plugs?
 
J

jay127

Seaman Apprentice
Joined
May 17, 2010
Messages
47
Re: Carb/prop issue

carb brand new built specifically for the 4.3 liter. again the boa runs great but it would be nice that once its on plane the 4 barrels would open all the way. but im fine with 47 its nice having it run so good.
 
M

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Re: Carb/prop issue

There are more than two springs available from Holley. The spring kit comes with documentation of ratings for the springs.

It may not be able to take all 4 barrels wide open, I bet the setup that gets you 47mph is all she needs :)
 
Boomyal

Boomyal

Supreme Mariner
Joined
Aug 16, 2003
Messages
12,072
Re: Carb/prop issue

IMHO and according to many a CFM calculator, 600 CFM is way more than necessary for a 4.3 l engine. It is even too big for a 5.0 liter engine. Holley does make a 500 CFM 4160 which is ideal for most all Small Block V8's and smaller.
 
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