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Firing order

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Old 05-31-2012, 05:41 PM
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Default Firing order
Am currently building a 4.6 stroker and one thing I haven't seen on here is firing order. Do the 4.0 and 4.2 engines have the same firing order?
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Old 05-31-2012, 05:42 PM
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Not sure about the 4.2 but I know I have seen the firing order stamped on an intake manifold.
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Old 05-31-2012, 05:44 PM
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same here, I was going to say its stamped on the manifold
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Old 05-31-2012, 05:47 PM
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I actually don't have a 4.2 intake manifold so I'm still kinda lost I was hoping someone who has built a stroker knew
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Old 05-31-2012, 05:58 PM
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I just "google" searched "Jeep 4.2L firing order" and got it.
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Old 05-31-2012, 06:17 PM
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Originally Posted by poorstang
Am currently building a 4.6 stroker and one thing I haven't seen on here is firing order. Do the 4.0 and 4.2 engines have the same firing order?
They better if their crankshafts are interchangeable..........
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Old 05-31-2012, 06:22 PM
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Originally Posted by cruiser54
They better if their crankshafts are interchangeable..........
Hm. Good point.

:facepalm:
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Old 05-31-2012, 06:27 PM
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Yes, the firing orders are the same. Im using a 4.0 distributer in my 4.2 block. Now at 4.9L.
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Old 05-31-2012, 06:48 PM
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Thanks for the info guys
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Old 05-31-2012, 06:51 PM
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Originally Posted by poorstang
Thanks for the info guys
Welcome. Im getting ready to put a 4.3 Chevy HEI in mine. You can buy one for 100 bucks from 4WD Hardware just gotta trace and tap wires accordingly from one module to another.
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Old 06-01-2012, 06:58 AM
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Originally Posted by Gee oh Dee
Hm. Good point.

:facepalm:
And their cams.... LOL.
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Old 06-01-2012, 08:09 AM
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Originally Posted by cruiser54

And their cams.... LOL.
Yes, when building a stroker and choosing a cam, pay attention to the duration. You want a little more duration to compensate for the larger bore.
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Old 06-01-2012, 12:42 PM
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What cam would u suggest?
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