Whats a good carb for the 225

Looking to put an offy dual plane intake on my Jeepster with a 225.
What carb would be the best for this. I will be updating the exhaust soon.
Other than a Hei. Everything is stock. Trying to get a little more out of the 225 to warrant keeping it than dumping a v-8 in it.

 

The old 2300 series 2 barrel-- like a 350 cfm Holley two barrel is pretty good--or even a larger Holley 500 cfm . But the floats on 2300 series are not too good off road. The stock Rochesters are better off-road than the Holleys. But the Holley is very good on the street. But I am sure that some other Dauntless owners on this board have some good alternatives ideas too.

 

Yeah Its a 4 barrell offy. Square bore. I was going to use a quadrajet but it was too much of a pain. Ive heard that the holley 390 works good but small passages will plug. So I now I am looking at the edel 500cfm, but I dont know if that is too much cfm. I know a guy running a 500 on a 4.3 liter and once he jetted it down it worked for him, but he used the smallest jets that edel makes.

 

Check out the tech section and consider using the forum search.

 

smiggley: The Q-jet is an excellent carb for the 225, but it is a spreadbore. They were used on the high perf. 225 marine engines for Mercruiser. Now, remember boats bounce a LOT! When I was in college, I worked for my uncles boat shop and did many a tune up on them. But they aren't used anymore so they are sort of like "hen's teeth". IIRC, they were about 350-450 cfm.

I'd love to get my hands on one of those manifolds and carbs.

 

www.downeyoff-road.com sells a few items for the 2300 that improves it's off-road performace.

 

i just went through this whole thing, asking the same question:

what i found was that as far as 4bbl goes 390cfm is about as much as you wnat (although bigger has been done ie: see front page about 500cfm) holly is coming out with their 450cfm truck avenger carb soon, but i think thats still to big, what i decided to do was keep my holly 390 and rebuild it. when i rebuild it i will also order from holly their spring loaded needled kit which will run about 34 bucks for the two of them ($17 each) holly told me that this setup would be great and they said doing that they wouldnt waste the money on a new truck avenger carb. i am also going to get rid of my non working elec choke and go back to a manual choke setup.

 

This topic has been discussed before - you'll find some good info if you search.

Downey shows a 2300-350 with a center pivot float bowl. I don't know what axis the mounting on a Toyota is, but a center pivot is intended for flat track racers with lots of lateral Gs. A side pivot float worked better uphill and downhill on my 304. Side pivot is the usual configuration for stock carbs. Center pivot could be better on side-hill, but the usual problem with Holleys is flat spots or flooding on steep uphill/downhill.

You can fix the vent height so that gas doesn't flood out, add slosh tubes to the jets, use a spring loaded float (to dampen float bounce), and probably others.

The 20R Weber might work ...