switching out intake and carb

[LT-1 kid]

hi, i am new to this forum, and had a question on replacing the the 2 barrel carb and intake to a 4 barrel carb and intake, is there any new brakets or any problems i should be aware of, it a 2002- 20' ebbtide BR boat with a 305 mercruser i/o with vortexs heads, and what is the best intake and carb comb on this type of boat and motor , boat is used for skying and crusing, i do like more top speed, right now 52 mph is max at 4800 with a 4 blade 20 p, thanks greg

 

[Bondo]

Re: switching out intake and carb

is there any new brakets or any problems i should be aware of,

Ayuh,.....

What you've got now,... Won't fit....
You'll need to do some Re-Engineering....

what is the best intake and carb comb on this type of boat and motor ,

Ayuh,....

Many have done to swap using the Edlebrock Performer Carbs(600cfm),+ Manifold.....

 

[John_S]

Re: switching out intake and carb

You need to make a new fuel line, buy a new flame arrestor, make/mod or buy throttle cable bracket. The Edelbrock 1409 and Performer EPS for vortec heads should be fine, assuming you are raw water cooled and run in freshwater. Speed increase will probably be around 2-4mph.

PS: The edelbrock manifold will not have a place for the warm-up fitting. The alum manifold will heat up faster than cast, anyway. Will need to plug at elbow.

 

[rndn]

Re: switching out intake and carb

Welcome to the forum!!

 

[Maclin]

Re: switching out intake and carb

That performance sounds pretty good already, 52mph at 4800 rpm. I would tend to re-think any engine mods and the problems they could introduce. You will probably have to pitch up some to keep from over-revving if those mods help.