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| Head Gasket Question https://slantsix.org/forum/viewtopic.php?t=27380 |
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| Author: | dakight [ Sat Feb 23, 2008 5:55 pm ] |
| Post subject: | Head Gasket Question |
I spent some time working on the head today and I think I'm nearly ready to sent it to the machine shop. One thing puzzles me however. When I drop the head gasket over the head and line it up I don't see a lot of room to unshroud the valves. I'm putting in the 1.7 / 1.44 valves. The ring of the gasket appears to lay right on the edge of the chamber. When i position the gasket on the block there is a very small portion of the block surface showing. The block is bored .060 over. I've heard of a larger bore gasket available I think from Australia; do I need to spring for one of these? |
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| Author: | sandy in BC [ Sat Feb 23, 2008 6:36 pm ] |
| Post subject: | |
I was just looking at my old head gasket yesterday. Victor The reliefs around the valves just catch the outside of the steel sealing ring.....and show no signs of failure. |
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| Author: | Doctor Dodge [ Sat Feb 23, 2008 8:21 pm ] |
| Post subject: | |
Yes, the US made gaskets do not give you much room to unshroud the O/S valves. The best you can do is go in there with a small grinding tool and work the side of the chamber, up close to the valve seat, and not remove material where the gasket surface is. Said another way, you "undercut" the side of the chamber. Use the head gasket as your guide. The head gasket from Oz gives you more room to grind before hitting the "fire ring's" sealing surface. DD |
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| Author: | dakight [ Sun Feb 24, 2008 5:42 am ] |
| Post subject: | |
Is this the one I need? http://tinyurl.com/29etvz |
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| Author: | Dart270 [ Sun Feb 24, 2008 7:24 am ] |
| Post subject: | |
That may be OK. Best to call/email them and ask for fire ring ID. I have two types of Aussie gaskets - Permaseal, which has a huge 3.66" bore, and another (ACL?) that has 3.56-3.58" bore. Lou |
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| Author: | dakight [ Sun Feb 24, 2008 8:26 am ] |
| Post subject: | |
The onw pictured is listed as an "ACL" gasket. I'll email them just to be sure. I think 3.66 is probably way more than needed but 3.56 might be just about right. Thanks for the info. |
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| Author: | Dart270 [ Sun Feb 24, 2008 3:09 pm ] |
| Post subject: | |
OK, my "smaller" Aussie gaskets are 3.540-3.545" diam. Sorry to overstate earlier. They are indeed ACL gaskets. Lou |
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| Author: | dakight [ Sun Feb 24, 2008 6:10 pm ] |
| Post subject: | |
I just measured my Victor gasket and it looks like it's 3.52. I also laid it on the head again, with better light and it isn't as tight a fit as I first thought but still I'd like to have a little more space to work with. I'm going to email a couple of places in Oz to see what they've got. A couple of folks have expressed interest so I'll post my results when I get some answers. |
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| Author: | Dart270 [ Sun Feb 24, 2008 6:14 pm ] |
| Post subject: | |
The ones to get direct from Oz are the Permaseal - 3.660" bore and excellent sealing properties. Lou |
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| Author: | dakight [ Sun Feb 24, 2008 6:18 pm ] |
| Post subject: | |
Favorite or suggested vendor? |
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| Author: | Dart270 [ Sun Feb 24, 2008 7:02 pm ] |
| Post subject: | |
Sorry, no idea on a specific vendor. I got mine through Cameron Tilley. He may send you some if you get a group buy together, or ask nicely. May not be worth shipping one, but if you get some people together, it's not too bad. http://tilleyracing.com.au/ Lou |
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| Author: | dakight [ Mon Feb 25, 2008 3:26 am ] |
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Thanks Lou, I just sent Cameron an email. |
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| Author: | Doc [ Mon Feb 25, 2008 10:25 am ] |
| Post subject: | |
A picture may help... I was doing a lot of head to block matching this weekend so I snapped some pics of the big bore gasket compaired to the US made gasket. (the red colored one) As you can see, the big bore gasket is way big for my .060 o/s bore, even with the wide side cuts I have for the o/s valve -head combustion chambers. DD  
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| Author: | dakight [ Mon Feb 25, 2008 4:06 pm ] |
| Post subject: | |
Wow, those bores are enormous; would give me plenty of room. I haven't heard back yet from Cameron. |
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