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Old 06-04-2002, 05:59 PM   #1
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Difference between Fel-pro 1011-2 and 1011-1

Which one to use with iron heads?
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Old 06-04-2002, 06:11 PM   #2
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-2 is copper, -1 is steel fire ring. I think that the -1 should be used for iron heads. Personally I prefer the 8548pt2 gaskets that are the Advance Auto standard issue.

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Old 06-04-2002, 06:25 PM   #3
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Thanks that's what I needed to know. I heard -1 for iron at work and just wanted another opinion.
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Old 06-04-2002, 07:12 PM   #4
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-1 for iron, but the part number given above is half the cost and many of us consider them to be superior to the 1011 series....
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Old 06-04-2002, 07:26 PM   #5
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[QUOTE]Originally posted by Billy Edwards
[B]-2 is copper, -1 is steel fire ring. I think that the -1 should be used for iron heads. Personally I prefer the 8548pt2 gaskets that are the Advance Auto standard issue.

Maybe I'll give them a try. How are they under boost? Are you using them on your turbo car?
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Old 06-04-2002, 09:55 PM   #6
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Sorry guys, your all wrong!
Both gaskets are the same except for the thickness. The -1 is .041" thick and the -2 is .039" thick. They have a steel fire ring, nothing special. Lots of people think these gaskets rot and leak coolant. But I used them for a year with 150 shot of NOS many, many times! With stock heads. Last month I put on the new heads and I used that other Felpro # 8548pt-2. That is the stock replacement, it is around .055" thick or so. (new heads are oringed!)
When I removed the 1011-1's they were MINT. If your using BOOST I would recommend the stock replacements because they are thicker...don't boost applications like less compression?
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Old 06-05-2002, 11:23 AM   #7
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Quote:
Originally posted by 87gtNOS
Sorry guys, your all wrong!
Both gaskets are the same except for the thickness. The -1 is .041" thick and the -2 is .039" thick. They have a steel fire ring, nothing special. Lots of people think these gaskets rot and leak coolant. But I used them for a year with 150 shot of NOS many, many times! With stock heads. Last month I put on the new heads and I used that other Felpro # 8548pt-2. That is the stock replacement, it is around .055" thick or so. (new heads are oringed!)
When I removed the 1011-1's they were MINT. If your using BOOST I would recommend the stock replacements because they are thicker...don't boost applications like less compression?
Where in the hell did you get all this disinformatio? The 1011s are different, and the stock replacement 8548 sure as hell isn't .055 thick. You could have done something as simple as opening a Summit catalog to the gasket page before posting this misleading crap, right there on the page -2 is copper and -1 is steel, and both are .039 compressed. The 8548 isn't listed but the do sell them, and its either .039 or .040 compressed. Don't reply to things you don't know about, you aren't doing anyone any favors...
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Old 06-05-2002, 12:09 PM   #8
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Take it for what it is worth, but my AFR catalog specs the #1011-1 gasket for 1962 to 1982 SBF engines using their aluminum heads, and the #1011-2 gasket for 1983 to 1993 SBF engines - still using the same (AFR 165 or 185) aluminum heads. I don't know what is different, but it doesn't seem to have much to do with aluminum verses iron. I used the #1011-2 gaskets on my '91 when I put on a set of AFR 165 heads last fall, but I haven't driven the car enough to tell how well they will hold up.
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Old 06-05-2002, 12:32 PM   #9
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listen Turbo boy...Direct from the Felrpo performance catalog # 902-00. I'm at work now!
1011-1 bore 4.1" nom. comp. thickness: .041"
compressed volume 9cc
1011-2 bore 4.1" nom.comp. thickness: .039"
comoressed volume 8.5cc
BOTH are made of Pre-flattened steel-wire core laminate. They both are black with pretty blue sealer around the water passages.
The stock replacement 8548PT-2 is around .060" thick when new, so I suppose it's around .055 thick when installed. I measured a new one.

As for AFR or other head manufacturers recommending different #'s, is because of Blowers and turbos and compression ratios.
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Old 06-05-2002, 01:18 PM   #10
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Alrightie, rather than get into a big pissing match I assumed that it was possible (thought not likely LOL) that I was wrong, though the stuff I go by is pretty much widespread.... I called Felpro (Federal-Mogul now) directly, turns out we are both about half-right....

1011-1 is steel, .041 thick

1011-2 is copper, not steel as you claimed, and .039

8548PT-2 is steel, .047 thick (that one surprised me, didn't know they were that thick!)

9333PT-1 is a graphite gasket, stainless steel fire ring, also .047 thick

Its good to know those last two are thicker for the forced induction crowd, also good for n/a guys to know when trying to keep comp. up....

There, no more misinformation from anywhere....
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Old 06-05-2002, 01:53 PM   #11
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Yes, the measurement of the stock ones was by hand!! but very close.
I sell these things everyweek.
But I have never actually had the 1011-2 in my hands. The catalog, though, does not say anything about copper! I do suppose that it really doen't matter though...
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Old 06-05-2002, 04:20 PM   #12
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So is it OK to use the 1011-1's for aluminum? Or will the damage the aluminim heads deck.
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Old 06-05-2002, 05:27 PM   #13
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Wow, you guys are brutal. I used the -1's on my aluminum heads with no problems.
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Old 06-05-2002, 05:55 PM   #14
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Any of those #'s are fine...look at the specs...
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Old 06-21-2014, 01:35 PM   #15
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1011-2 Actual Picture

I know this is an old post, but if your searching for info regarding the FelPro 1011-2, I took a picture of it. It does say it's copper, but it must be under a shield of steel cause that isn't copper I see. Good luck with your engine build fellas!
Attached Images
File Type: jpg 1011-2_FELPRO.jpg (74.9 KB, 35 views)
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Old 06-21-2014, 03:47 PM   #16
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You're all wrong.....

Difference between Fel-Pro 1011-2 and 1011-1?

1011-2
-1011-1
= -1


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Old 06-21-2014, 04:13 PM   #17
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Wow, this is crazy.

All the arguing about numbers and specs aside, the 1011 gasket is in all practicality inferior to both the 8548 and 9333. Unless I absolutely needed the thickness of the 1011 (-1 or -2), I would always go with either the 8548 or 9333. Otherwise it's going to be an MLS gasket.
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Old 06-21-2014, 04:52 PM   #18
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Used 1011-1 for 5 years on aluminum heads 22psi block looks good so do heads. I have been using them for a while with no reasons to change.
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Old 06-21-2014, 05:28 PM   #19
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Why do I keep seeing this word "inferior" when it comes to these gaskets? As long as the heads are new or milled and the block is new or milled, I have not heard of one failure with these gaskets. Mind you the block and heads HAVE to be perfectly flat as these gaskets are thin and are not forgiving to head and block imperfections.
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Old 06-22-2014, 10:16 PM   #20
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Yes, there are many who have used the 1011s with good success, even with forced induction, but like you said, it's not as forgiving as the other two cheaper gaskets especially when the sealing surfaces are not optimal.

IMO the main weakness with the 1011 is the fire ring construction. They tend to fail easily between cylinders. That may be due to the fire ring not being joined together at these locations, as they are with the 8548 and 9333. That fire ring construction may also affect how well the gasket can rebound after multiple heat cycles, particularly with aluminum heads and hotter engine temps. Another thing I don't like about the 1011 is that coolant can easily seep around the water jacket ports and erode the gasket over time. I don't really ever see this issue with graphite gaskets.
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Old 06-23-2014, 02:39 AM   #21
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Quote:
Originally Posted by 408foureye View Post
Yes, there are many who have used the 1011s with good success, even with forced induction, but like you said, it's not as forgiving as the other two cheaper gaskets especially when the sealing surfaces are not optimal.

IMO the main weakness with the 1011 is the fire ring construction. They tend to fail easily between cylinders. That may be due to the fire ring not being joined together at these locations, as they are with the 8548 and 9333. That fire ring construction may also affect how well the gasket can rebound after multiple heat cycles, particularly with aluminum heads and hotter engine temps. Another thing I don't like about the 1011 is that coolant can easily seep around the water jacket ports and erode the gasket over time. I don't really ever see this issue with graphite gaskets.
I agree, seems to me they have a shelf life. No matter how used, they eventually just rot away and fail.
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Old 06-23-2014, 02:47 AM   #22
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Let's see pics of the rot. I call bs have read to much misinformation in this thread if you are relying solely on hearsay and just wanting to up your post count do it in the lounge
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Old 06-23-2014, 10:27 AM   #23
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I used to use the 1011-2 for years. I would have to replace the head gaskets every three months like clock work. I quit using them. The 1011-2 have the copper ring in them. The 1011-2 have the stainless ring in them. I know of one guy using the 1011-1 head gaskets at this point he has not blow a head gasket, but they have only been on the car for about five months. I switched from the 1011-2 head gaskets to some expensive copper head gaskets and had the heads o-ringed. I again kept blowing head gaskets about every three months. I found out after the second pair, that I you are supposed to go back and retorque the heads regularly with the copper head gaskets. I would pretty much have to pull the engine to be able to properly retorque the heads, because of the headers and intake. So I would just run the engine till one of the gaskets blew and then pull the engine and replace the gaskets. That got old. From my experience, copper is not a good choice of materials to use, if you want low maintenance head gaskets. I also found that you should retorque the 1011-2 head gaskets often.

What I was told many years ago was 1011-1 for iron heads and 1011-2 for aluminum heads. I might try the 1011-1 gasket someday, but probably not, but I won't use the 1011-2 again.

If I wanted low maintenance head gaskets when using iron heads, I would use Fel Pro 9333 PT2, I think that's the part number. The only good thing about the Fel Pro's print-o-seal style head gaskets, is it is easy to clean the block and heads up after using them. I have not used any in a long time.
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Old 06-23-2014, 10:22 PM   #24
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Well here I am with two brand new 1011-2's and don't want to even use them now. Dam it man! I needed that .039 compressed thickness to hit the 9 to 1 CR. I have new 61cc TW170's so any suggestions what to use? I do not want to spend more than I spent on these.
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Old 06-24-2014, 11:07 AM   #25
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