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Old 06-04-2002, 04:59 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, 05:11 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, 05:25 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, 06:12 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, 06:26 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, 08:55 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, 10:23 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, 11:09 AM   #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, 11:32 AM   #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, 12:18 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, 12:53 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, 03:20 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, 04:27 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, 04:55 PM   #14
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Any of those #'s are fine...look at the specs...
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