Re: 356 CI Compression Ratio
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They are like hens teeth. I asked about the compression ratio they provided as another data point as to what was run on the 356 in the past. Although the head looks flashy having dissimilar metals with different expansion rates joined together increases the chances of seal/gasket failures as well. Anybody know what the CR was for these heads? I've not yet seen evidence that there were different Edmunds Packard heads for the 288/327/356/359 8 engines, just one. If so, that would give different CR for the different engines which doesn't make much sense. Anybody have information, or know what CR one got with it on the 356?
Posted on: 1/10 15:19
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1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series) 1955 Patrician Sedan 1955 400 Sedan |
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Re: 356 CI Compression Ratio
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I have found some iron heads from 22nd series and later -- at least three 288 heads, a 327 and a 356, plus one mystery HC head with no displacement indication. I assume HC is high compression, but oddly the combustion chamber is much deeper on this head. It also doesn't have the flat center ridge running front to back. Anybody have info on what this HC head is intended for?
![]() Also, any way to distinguish a 327MT vs. 327AT head? ![]()
Posted on: 1/30 13:57
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1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series) 1955 Patrician Sedan 1955 400 Sedan |
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Re: 356 CI Compression Ratio
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I think if you're trying to get a little more HP, this should do the trick.
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Posted on: 1/30 19:42
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Re: 356 CI Compression Ratio
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Drop a Cybertruck drivetrain in it
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Posted on: 1/30 20:03
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry |
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Re: 356 CI Compression Ratio
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No need for a higher compression head with that big air pump on it. I don't think that will be much help with fuel economy.
Posted on: 1/31 0:24
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1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series) 1955 Patrician Sedan 1955 400 Sedan |
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Re: 356 CI Compression Ratio
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I pulled the 356 head and did some comparative volume measurements of the combustion chambers. The 356 measures 95cc, the 327 head is 90cc, and the HC head is 120cc. Very little difference between the 356 and 327. Why the supposedly HC head is so huge is a mystery. With that head I think the compression would be too low for the gasoline to even combust -- the engine would not start. The plan is to install the 327 head but with such a small difference I'm tempted to check volume on a 288 head to see how it compares. I'm wondering if the 356 head has already been planed at some point in it's life. If one does the math assuming the 356 head is stock, there's a 5% difference in volume so a CR of 6.85 would become 7.21, not the 7.53 per the chart.
However, as it seems whenever something is torn into other issues arise and this time is no different. Head removal revealed a problem with cylinder #4. The rest all look just fine and the head gasket appeared fine with no indication of leakage anywhere. There is oddly some severe metal erosion on the intake valve head and on the block between the cylinder bore and exhaust valve. Picture attached. The seat on the intake looks okay still, but the seat on the exhaust looks compromised -- not severely but I assume there's some leakage. Any ideas how this could happen on just #4? ![]()
Posted on: Yesterday 21:58
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1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series) 1955 Patrician Sedan 1955 400 Sedan |
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