Direct replacement for OMC 5.7 Rochester quadrajet

[ss9940_2]

Hi there fellow iboaters!


Can any 1 suggest a direct replacement for a Rochester quadrajet? The engine is a 5.7 OMC, GM Engine. I would really need a "bolt in" carb, don't wanna modify anything.

Thanx in advance,

Alex

 

[wire2]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

I believe both Holley and Edelbrock offer marine versions of popular model carbs, but they will probably not bolt on directly. The quadra-jet has 7/8" primaries, 2-1/4" secondaries that make it somewhat unique. You might have to replace your intake manifold also.
I'm curious why you want to lose the quadra-jet? Mine has run flawlessly for many years.

 

[ss9940_2]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

Hey!

It's cause the old one is junk. Doesn't work right after 2 rebuilds. Plus, the fuel economy is supposed to be far better with an edelbrock or holley

 

[KaGee]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

Hey!

It's cause the old one is junk. Doesn't work right after 2 rebuilds.

Couldn't be the rebuilder, could it?

Or another thought... maybe whatever problem you have is not the Carb?

 

[ron7000]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

Hi there fellow iboaters!


Can any 1 suggest a direct replacement for a Rochester quadrajet? The engine is a 5.7 OMC, GM Engine. I would really need a "bolt in" carb, don't wanna modify anything.

Thanx in advance,

Alex

direct replacement from holley is a model 4175. It is a spread bore carb, opposed to the traditional holley square bore and will drop directly onto whatever you had the QJ sitting on. So you wouldn't have to change your intake manifold or use a manifold adapter/spacer. But it probably won't be a complete drop in, things like the fuel line fitting and throttle cable bracket may need replacing and the holley has electric choke so you'd need to wire it to the ignition, all of which is simple and holley is pretty good with parts like that.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HLY-0-80552&N=700+115&autoview=sku

 

[Gary H NC]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

Best price on a exact replacement is here.just send them or call with the Rochester number off the carb..
Or they will rebuild yours..

http://www.guaranteedcarbs.com/?gclid=CJ6ZkcHO_4wCFRI7ZQodPT_eDg

 

[Coors]

Re: Direct replacement for OMC 5.7 Rochester quadrajet

Couldn't be the rebuilder, could it?

Or another thought... maybe whatever problem you have is not the Carb?

What is the problem, exactly?