4.0 head on a 258, can I keep the carb? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-24-2002, 07:54 PM Thread Starter
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4.0 head on a 258, can I keep the carb?

Some of you guys may think I'm backward, but I like carbs, mainly for simplicity of the fuel system. I want to put the better flowing 4.0 head on my '81 258, but want to know if there is an intake that will bolt to the 4.0 head & accept a carb? The carb I have is a Holley 390 four barrel.
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post #2 of (permalink) Old 10-24-2002, 08:32 PM
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Re: 4.0 head on a 258, can I keep the carb?

You can use your stock intake.
You just have to be careful as you practically have to hand align it to make sure you get a good seal. Suggest you use a VERY thin smear of Permatex Ultra Coppper as a sealant.
If it were me, I'd get a 4.0 intake gasket and use it to do a little match porting to smooth out the transition air flow.
You'd still probably need to use a 4.2 intake gasket on assembly, trimmed to match the porting if that was done.
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post #3 of (permalink) Old 10-25-2002, 02:57 PM
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Re: 4.0 head on a 258, can I keep the carb?

Watch your years however. If you want to keep the carb manifold stick to the '91-95's for your head. I used a '98 head and the carb intake would not line up correctly (or at least my '80 intake). I decided to go all the way with the FI so it worked out great for me. Good performace upgrade.
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