SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: surf on January 26, 2007, 06:55:02 AM

Title: need help on choosing carbs
Post by: surf on January 26, 2007, 06:55:02 AM
i have a holly 750 i was wondering if that is enough or do i need to get a new one.
Title: Re: need help on choosing carbs
Post by: hotrod56cars on January 26, 2007, 07:26:38 AM
What size is the boats engine? compression ratio? cam specs?
Title: Re: need help on choosing carbs
Post by: surf on January 26, 2007, 07:51:09 AM
its an olds 455.  i have not gotten a cam yet i am still in the prosses of puting the boat thgether i got the boat as a project. i bought it cheep from someone that said they had it on theirs but i have heard that the carb is to small from others.
Title: Re: need help on choosing carbs
Post by: hotrod56cars on January 26, 2007, 09:13:28 PM
A 750 Holley is definately enough to support a 455, but not necesarily yours, compression ratio?

The more HP you want out of it (i.e.: high compression, lopey cam, headers, porting, etc...) the bigger the carb (more cfm) needed. It sounds like you're going to need more info on your engine before you can determine if your carb is big enough.