Re: Compression ratio of 327 head; year of the engine block?
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Forum Ambassador
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Empire has had threads on this and AACA forums over the last few years. Here is one started in 2012 so hopefully someone can provide newer information. Perhaps a visit to the consumer website mentioned in the post would have current info.https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=10963&viewmode=flat&order=ASC&type=&mode=0&start=0
Posted on: 2016/9/4 18:16
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Howard
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Re: Compression ratio of 327 head; year of the engine block?
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Quite a regular
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Thanks, Ross. That was enlightening. My engine has run only an hour in the past 30 years, so one cylinder is not yet firing. But the car runs pretty smoothly to be missing on one cylinder.
My problem with the 327 head has, obviously, been the issue of what compression ratio the car is running. Since I have personally noticed the car running smoothly on 7 cylinders-though smoking like a choo-choo train, I am sure it is not running on TOO MUCH compression ratio right now. I wonder if it would run better on the Edmund knock-off head.
Posted on: 2016/9/4 21:10
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Re: Compression ratio of 327 head; year of the engine block?
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Home away from home
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I always add this when talking about valve seats. DON'T PUT HARDENED SEATS IN A PACKARD INLINE BLOCK. It's a high nickel casting more akin to cast steel than cast iron. Adding valve seats helps the machine shop and if they fail will continue to help it. Worried about valve seat erosion? Run Stainless Steel Valves. All told that's a relatively affordable option to seats and they're not going to fail. There's always the occasional splash of race fuel or lead substitutes (which you don't need every time you gas up) to offer the engine a bit of old school protection. The use of Rotella or similar high zinc oil also goes a long way to keeping things protected the old way. Good luck...
Posted on: 2016/10/16 12:12
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Re: Compression ratio of 327 head; year of the engine block?
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Quite a regular
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Continuing the discussion. I have a '54 Convertible with a 359ci engine. I have been offered a 288 AT head, #420537, casting date 12-17-51. Would this be a suitable replacement for my aluminum Head?
Les
Posted on: 2016/10/21 18:27
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Re: Compression ratio of 327 head; year of the engine block?
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Home away from home
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Believe that head is rated 7.5 : 1 on the 288. By my calculation, that will give you 9.2 : 1 compression on the 359 The car will be scarcely drivable without racing fuel.
Posted on: 2016/10/21 18:53
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Re: Compression ratio of 327 head; year of the engine block?
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Quite a regular
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Thanx, Guess I'll look for a 50-52 327ci standard head.
Posted on: 2016/10/22 10:55
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Re: Compression ratio of 327 head; year of the engine block?
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Quite a regular
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My 359 c.i.c. engine has a 327 head but I do not know from whence it came-i.e., I don't know the year or comp. ratio of the head. HOW can I tell which head it is?
Posted on: 2017/3/11 21:05
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Re: Compression ratio of 327 head; year of the engine block?
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Forum Ambassador
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The casting date will be the best information on the head itself, the casting number isn't particularly useful. Since you don't have a full history on the head the only accurate way to determine the current compression ratio would be to "cc" the combustion chambers and then do the corresponding math.
Posted on: 2017/3/11 21:19
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Re: Compression ratio of 327 head; year of the engine block?
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Quite a regular
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Thank you for your reply. This engine purrs like a kitty, smooth as can be, so I will just presume it's a 1954 327 head, which gives it almost exactly the same compression ratio as the aluminum head would give me on this engine. The difference, according to the charts on this site, is negligible-which explains why this engine runs so well. All things considered, I am quite confident that the head swap was done back in the day when Packard mechanics were still around in more abundance than today.
Posted on: 2017/3/13 5:31
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