Engine swap for a 1998 F-150 4.2L to a 5.0L
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Mine would be don't bother, you can put a stock PI 5.4L in very easy compared to the 5.0L and it will have 260hp, the 5.0L stock won't have anything near that. With all the bolt on's you can think of you could push 300hp fairly easy with the 5.4L then stick a 50 shot of nitrous on it for a cheap performance fix.
For all the time and money a 5.0L would take you could tear into a 5.4L or even 4.6L and should be able to push 350hp N/A out of them with reworked heads and intake etc etc. Or you could just drop $4K on a low psi blower and be at 350hp easily.
For all the time and money a 5.0L would take you could tear into a 5.4L or even 4.6L and should be able to push 350hp N/A out of them with reworked heads and intake etc etc. Or you could just drop $4K on a low psi blower and be at 350hp easily.
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It would be far cheaper to get the 5.4L to work than a 5.0L. Aside from a ECU reflash the 5.4L is more or less a bolt in, as close to one as you can get these days. You could run it off all the 4.6L wiring. It would be easier to go to a NPI because of some sensors the PI would have but really nothing major compared to trying to get a 302 to work.
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the boy took a 4.2 out of an F150 and installed a 302. They used a distributor and carburetor to keep it simple. Had to make eneing mounts, etc. Biggest problem they had was it vibrated BAD when they got done. I did a little research and found the 4.2 is a balanced motor. The 302 he had was externally balanced with the flywheel and harmonic balancer. I had to pull the motor and remove the flywheel, machine it to match othe old counterweight flywheel and reassemble. Dont remember the full story, but the starter hole was too far over to use the 302 flywheel and they had to get one to bolt to the 302, aht would accept the 4.2 motors transmission and clutch, etc. LOTS OF WORK, but runs o.k. for past 6 months.
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#12
Originally Posted by ggarrahan
What are the emissions laws in Tennessee? Here in California the swap you mentioned would not be legal for street use, as it would not pass our smog inspections.
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I really hate to necro a 12 yr old thread but l just registered and can't wait 10 days to email some one. I'm going to swap an explorer motor in my f150. Steve(ill) when you say you machined the flywheel because of vibrations. Can you remember exactly what was done? I was going to do carb swap but lm seeing posts on tweeking the edis controller of the 4.2 to control the 302. I can run the entire emissions system and fi/ecu from the explorer if l can make it emissions legal. I can flash the ecu to recognize the vehicle change.
#14
its been a LONG time, but as I remember, the original flywheel for the 302 had large casting recesses on one side, then several drilled holes as a final balance... The wheel they were using was like 1.25 inch SOLID THICK ( built to bolt onto the 302, but match the 4.2 L trans/ starter gear)............ I ended up with the wheel in a milling machine and cut out " about" the same quantity of metal that was missing in the original flywheel.......... Seems like it ran rough at 600 rpm, and was shaking BAD when you got to 2000 RPM........... after the milling was done, it was smooth as you would want.
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note the casting weight built into this flywheel, as compared to a solid ring.
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