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Old 02-24-2004, 06:32 PM
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Unhappy street-legal (viz. emissions-passable) performance enhancements

From a Driver [not a Tech Expert like you guys]:

General:
I’ve been reading outlandish-sounding descriptions in this board about how you all are swapping engines, swapping/porting heads, radically modifying intake, exhaust, boring out the block, putting in rumpity-rump cams, etc. – how do you do it and pass emissions? I have an ’81 Olds Custom Cruiser wagon with a bored, balanced and cammed 403 paired with a TH400 trans. [Her name is Mathilda -- ‘nuff said.] Emissions is not an issue because in her earlier life she was a Diesel [which is emissions exempt] and I just never got around to telling the DMV about the engine swap. Maybe next year…

Specific:
Pops gave me his ’83 Merc Grand Marquis [‘cause he knows I’ll take care of her]. She’s a real charmer, but the 5.0 engine sure could use some help! I had to reconnect the EGR valve [Dad lives in rural VA and had no emissions worries] and acceleration is very poor [expecially compared to the above-mentioned wagon] even at the most optimal settings.

Would you be so kind as to give me some options as to what can be done to a Ford 5.0 of that vintage that would still pass emissions [from mild to radical]? I still would like to know how some of you fiends get away with what you’re doing! Perhaps most of you are building for the track.

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Last edited by walford; 02-24-2004 at 06:53 PM.
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Old 03-01-2004, 04:45 PM
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just a thought but maybe that 5.0 is to small to push that big Merc around?? Maybe you could find a 460 truck engine from an 83 PU and swap everything to the Merc?


Tazz
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Old 03-02-2004, 07:44 PM
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Quote:
Originally posted by tm454
just a thought but maybe that 5.0 is to small to push that big Merc around?? Maybe you could find a 460 truck engine from an 83 PU and swap everything to the Merc?


Tazz
Oh, there is no end to the engines that I'd like to put into that beast. Wasn't Ford putting 351's into Crown Vics of that year? The problem is it has to pass emissions as if it had the original engine in it.

I found that out the hard way when I swapped out the original 307 for a '79 Olds 350 in an '87 Chevy wagon. The 350 got better gas milage, better power and reliability. I also put in a custom dual exhaust system too. I'll bet it ran cleaner to boot, but it failed.

A 460 in front of me?
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Old 03-04-2004, 05:26 PM
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mmmmm 460
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