1987 4.0 Head Conversion Roadblock, need help - JeepForum.com
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post #1 of 6 Old 10-16-2021, 08:57 PM Thread Starter
OilfieldCowboy
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1987 4.0 Head Conversion Roadblock, need help

We are onto buttoning up our 1987 4.0 head conversion and have come to a roadblock where the 4.2 intake manifold wont bolt up without a spacer of some kind due to the heated bowl impacting the banks headers.

Two questions:
Are there any different options for intake that will bolt up to our TBI and fit with headers? I have seen the Clifford conversion intake, but from what I can find they are built for higher RPM power at the sacrifice of bottom end.

Are there better options for manifolds or headers rather than the Banks?


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post #2 of 6 Old 10-17-2021, 11:05 AM
shaggyjim
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Can you dimple the header to give you room. Was the header built for a FI or Carb?
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post #3 of 6 Old 10-17-2021, 07:38 PM
Boojo35
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Quote:
Originally Posted by shaggyjim View Post
Can you dimple the header to give you room. Was the header built for a FI or Carb?
Is dimple just a nice term for beat the eff out of it with a hammer because you are frustrated, dirty, and had too many beers?

I ask because there are dimples, and then there are dimples. They both read the same on the net.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #4 of 6 Old 10-17-2021, 08:08 PM Thread Starter
OilfieldCowboy
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Quote:
Originally Posted by shaggyjim View Post
Can you dimple the header to give you room. Was the header built for a FI or Carb?

I would have to crush the header tubes to the point of restriction to get it to fit. Header is for the 4.0 since 4.0 swap, so Im assuming it was built for FI. Ill be calling Clifford tomorrow to see if their 4.0 carb intake manifold has longer runners to clear the header.
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post #5 of 6 Old 10-17-2021, 08:40 PM
shaggyjim
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Quote:
Originally Posted by Boojo35 View Post
Is dimple just a nice term for beat the eff out of it with a hammer because you are frustrated, dirty, and had too many beers?

I ask because there are dimples, and then there are dimples. They both read the same on the net.
Truthfully it was a term I first ran across in a Hooker Header installation instruction paper. I was under the impression a "dimple" is less than 3/8ths ingress on the tube. The headers I was installing would have needed "DIMPLED" to almost crushed closed so your correct dimples and dimples.
So on a pointless side rant Hooker Headers are trash and I cant believe something so easy to set up in a jig still sucked so badly.
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post #6 of 6 Old 10-17-2021, 09:27 PM
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There are several headers that WON"T work underneath manifolds with the pre-heat 'bowl'. Doug Thorley and Banks are two that I sent back for that very reason. Being in Florida, I just ground the whole preheat chamber off of the manifold, plugged the inlet/outlet and called it a day. A GM style block heater or even a wrap of incandescent Christmas lights overnight made December and January cold snaps no problem.
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