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HELP Mystery 302 identifying

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benjardine95

New Member
Okay guys here's the scoop the grandarquis forums are full of idiots
So I own a 1984 grand marquis
It doesn't have the original motor you can tell it's been changed at one point
I personally did a head gasket job this past spring and much to my surprise I found it had flat top pistons with four vavle reliefs

Ford never put flat tops in a grandarquis until 1986 I believe or 87 and ford never ever put flat tops vavle reliefs in a grand marquis or crown vic . I did some digging and I believe only h.o motors come with flat tops and vavle reliefs am I correct ? Could I possibly have a h.o motor ? I well post pictures I took when I had the motor apart .

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benjardine95

New Member
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RTtim

New Member
It is very possible to have an H.O. engine. What about the cam in the engine now? Is it a roller cam? I don't think they used roller cams in the early vics and marquis .

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benjardine95

New Member
RTtim said:
It is very possible to have an H.O. engine. What about the cam in the engine now? Is it a roller cam? I don't think they used roller cams in the early vics and marquis .

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Idk if it's a roller or not . How do I determine if it is ? My car is bad in the barn now m I don't think crown vic got a full roller ever if I remeber I think they had like a semi roller set up idk

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RTtim

New Member
Just pull a lifter out and see if it is a roller lifter or flat tapped lifter. That will at least help narrow down a year range.

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benjardine95

New Member
RTtim said:
Just pull a lifter out and see if it is a roller lifter or flat tapped lifter. That will at least help narrow down a year range.

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I remeber the lifters were flat tappet.

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benjardine95

New Member
I doubt the motor was rebuilt. It's super strong running through 5000 km between oil changes doesn't take a drop of oil . And you have you run supreme or it spark knocks. It don't help that I advance the timing probably lol

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RTtim

New Member
With it being a flat tapped motor I would doubt it was an HO motor but really hard to say with out looking at every part. That is one thing nice about the Ford 302 is how you can mix a lot of factory parts to make it run a lot better.

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benjardine95

New Member
RTtim said:
With it being a flat tapped motor I would doubt it was an HO motor but really hard to say with out looking at every part. That is one thing nice about the Ford 302 is how you can mix a lot of factory parts to make it run a lot better.

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I read up that I'm 83 to 85 for had a non roller ho and I think 85 had the flat tops with four vavle reliefs . If I remeber correctly . I gotta do some more digging . I'm hoping it's a h.o cause then I have a good bottom end and I have a good start to my project

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