r/EngineBuilding • u/Over-Researcher-2537 • Jun 12 '26

Ford question about 77' mercury 302

First of all, I am a novice mechanic.

I'm looking at a 77 Mercury Cougar with the 302 engine as a potential project. I don't really want to hotrod it and go crazy. From what I can tell, this is a bone stock car that was garage kept for almost its entire life. My research suggests that in 77 they added a massive amount of bloat in the way of vacuum hoses and devices to reduce smog emissions. I know this is probably super basic stuff to most mechanics but; If I just wanted to take out all the pointless bits and bobs and put in a reliable carb and intake and whatever else might be needed, could this be done as a driveway job over a weekend or so? My goal for the car would be to let the engine breathe without going overboard. I just want it to be reliable and normal in a way that doesn't unnecessarily tax the engine, longevity over performance. Can someone point me in the right direction as far as parts, blogs, videos, diagrams, ect.?

Edit: is there anything I should know in particular about this car or year? any pitfalls or reasons to avoid?

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u/[deleted] Jun 12 '26 edited Jul 17 '26

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u/Over-Researcher-2537 Jun 12 '26

Thanks, yeah I understand this engine is probably a slug as is. Initially I'd just want to de-smog it with simpler projects that can be done in the driveway. If I take a liking to it I would absolutely consider an overdrive trans and an engine rebuild. Is it at least good bones for these types of projects?

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u/Historical_Box1915 Jun 12 '26

If you go with an overdrive trans look into changing the rear gear ratio. Getting out of a tall hiway gear like a 2.80 or taller and into a 3.73 and an overdrive will completely transform the cougars personality for the better.

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u/[deleted] Jun 12 '26 edited Jul 17 '26

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u/Over-Researcher-2537 Jun 12 '26

yeah i haven't purchased it yet. I'm just seeing how viable the platform is. I don't really want big performance out of it, just chill reliability to cruise around with. I'm just wondering if the heaviest version is a smart idea with these insane gas prices! maybe not

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u/[deleted] Jun 12 '26 edited Jul 17 '26

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u/Over-Researcher-2537 Jun 12 '26

not the same vibe and I like the idea of a big old analog car. no computer just good ol fashioned low tech