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Intake question on a 4l head swap |
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ncofab
AMC Fan Joined: Feb/12/2016 Location: edmonton Status: Offline Points: 29 |
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Posted: Mar/10/2018 at 11:15am |
Just wanted to know if a 90s 4.2 intake will work on the 4l head swap.
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matty 401
AMC Addicted Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1730 |
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it will just need modified what intake are you planning on using ?
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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ncofab
AMC Fan Joined: Feb/12/2016 Location: edmonton Status: Offline Points: 29 |
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Intake from a 90 yj with the 4.2
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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You'll need to match ports
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19608 |
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Basically all you need to do is make sure the top of the intake port is even with the top of the head. I've found that if you align the outside of the intake top edge with the outside top edge of the head you will be really close inside as well, about the same as a stock application. The two tabs on the bottom of the 4.2" intake with the holes for the alignment dowels need to sit on TOP of the dowels instead of in the holes. You may need to file the bottom of the tab a bit to align the tops of the ports. A rounded or V notch at the bottom will help to align them a bit. Once you do that you can gasket match the ports if desired, but for a stock rebuild it's not really necessary. Easy to do and doesn't hurt though. Just takes a file in most cases, a Dremel and grinding stone helps on the iron head though.
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Frank Swygert
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nosigma
AMC Apprentice Joined: Dec/30/2007 Location: McLean Va Status: Offline Points: 200 |
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As Farna mentioned.....I V notched the bottom of the dowel pin tongues as mentioned to fit a Clifford 258 4bbl manifold to my 4.0 head and it lined up perfectly.
John
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ncofab
AMC Fan Joined: Feb/12/2016 Location: edmonton Status: Offline Points: 29 |
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Awesome thanks for the information everyone
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