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post #1 of (permalink) Old 05-08-2009, 08:42 AM Thread Starter
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Carbs!

Ok so clutch issue is all insane still but thats not what im posting about this time!

So I was wondering is a Holley 4bbl Carb able to be used on a 258?

It would replace my stock carb.

1990 YJ 258 l6 3.5 BDS lift

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post #2 of (permalink) Old 05-08-2009, 09:44 AM
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It's been done, but is overkill, IMO. Years ago a buddy had a 4-barrel - Holley I think but am not sure - on a Clifford intake on his 258. It had vacuum-operated secondaries and we couldn't confirm that they ever opened more than a little bit.

On the other hand 4-barrels were big on the 283 and even 265 C.I. small-blocks when those engines were the hot setup, but they would spin 6,000 RPM and beyond when properly set up - WAY beyond what a 258 should be asked to do. I doubt that mine has ever been past half that speed.

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post #3 of (permalink) Old 05-08-2009, 11:43 AM Thread Starter
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Well i can get a brand new holley for about fifty bucks. Should i? Cause i have a stock 2 bbl

1990 YJ 258 l6 3.5 BDS lift

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post #4 of (permalink) Old 05-08-2009, 11:50 AM
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I ran a Holley 390 CFM on an Offenhauser manifold for a couple of years. I was pretty happy with it. I was using mine as a daily driver at the time. It gave me the power to pass and merge at interstate 70 MPH speeds.

Ive still got the manifold and carb somewhere in the basement. One of these days I may dig it out and put it in the for sale section.


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Originally Posted by Jim_Lou View Post
On the other hand 4-barrels were big on the 283 and even 265 C.I. small-blocks when those engines were the hot setup, but they would spin 6,000 RPM and beyond when properly set up - WAY beyond what a 258 should be asked to do. I doubt that mine has ever been past half that speed.
Jim, there are carbs and there are carbs. The 390 CFM seemed to be a pretty good fit for the 258. Those 283s could have been running as big as 650 CFM.

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post #5 of (permalink) Old 05-08-2009, 11:58 AM Thread Starter
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Hmmm so maybe i should put it on ill check what model carb it is

1990 YJ 258 l6 3.5 BDS lift

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post #6 of (permalink) Old 05-09-2009, 12:36 AM
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Quote:
Originally Posted by PHX? View Post
Ok so clutch issue is all insane still but thats not what im posting about this time!

So I was wondering is a Holley 4bbl Carb able to be used on a 258?

It would replace my stock carb.
The smallest Holley 4 barrel is a 390, and that is still a bit big for the 258 CID I-6 engine.

You will probably never get into the secondaries if it's a vacuum secondary carb, so it will 'WORK'...
I just won't ever work 'Correctly'.
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