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Early 327 production?

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8ton View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8ton Quote  Post ReplyReply Direct Link To This Post Topic: Early 327 production?
    Posted: Jan/15/2018 at 9:12pm

Started tearing down my Nash's engine to get the heads off to fix a stuck valve.

I think that this casting number is for a 327, but the casting date is 3/12/56. I was under the impression that 327s were not produced for '56. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2018 at 11:11pm
Does it have hydraulic lifters? A 327 should have hydraulic lifters and a 250 should have solid lifters.

You will know for sure once you get the heads off. A 327 has a 4" bore. A 250 has a smaller bore.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 6:43am
The 327 was introduced in the 57 model year. Production started around August 56, so some engines would have to have been made earlier. March seems a bit early, but could be. The bore should be cast in the block just behind the right cylinder head. If it's a "4" it's a 327. Might not be there on the early blocks though,  I don't know when AMC started doing that. Of course someone could have swapped a 327 in place of a 250. It's possible that a handful of very late production 56 models got a 327, or it could have been a test mule for the factory that was later sold off.

Definitely a 327 casting number. I have 8 327 block casting numbers listed, but only one 250 and one 287. 287 was only made three years, so no surprise there, but 250 was made six years (327 9). Might be more out there for the 250... the one I have is 3153077. If someone has another I'd like to know!


Edited by farna - Jan/16/2018 at 6:46am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8ton Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 7:50am
Yes hydraulic lifters and nonadjustable rockers. As FS said, we will know for sure once the heads come off, maybe today.
I assume that someone swapped this in, as the block and heads are painted lite blue with overspray into the valley, and the valley pan and 2 barrel intake is/was gray. The oil supply lines to the filter are also all bent to heck like you would expect a shop to do while swapping an engine.

The heads have a '56 date as well, so perhaps the long block came out of something in a junkyard or from a dealer, but with such an early date, the question is what. A factory pre production motor as farna suggest seems likely. By the way, it was your list of casting numbers I used to initially id the block, Thank you!
What compression ratios were available for early 327s?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 1:03pm
It appears to be coated in Glyptol inside, which would indicate that it has been rebuilt at some time as well.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mramc Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 6:13pm
1956 was the first year for the AMC gen 1 V-8. They were introduced in the mid year 1956 as they wanted to get rid of the Packard engines just as quick as they could. There is a special mid year press kit I have on the updated models. LRDaum
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 6:38am
The 56 250 was in the Nash Ambassador Special and Hudson Hornet Special only. Those were actually the smaller Statesman and Wasp two door club coupe bodies with the higher end model trim -- because the bodies were the lightest of the lines and would provide a bit better performance with the small V-8.

The 57 327 is listed as 9.5:1 compression, 58-59 9.7:1. High compression was 9.7:1 through 66. All high compression (57-66) models had 4V carbs. A 2V 8.7:1 compression version was introduced in 1960. There was only 20 hp difference between the two -- 270 hp for the high comp, 250 hp for low. The 57 8.5:1 model was rated at 255 hp... and I believe under rated. I can't see a 15 hp gain from a 0.2 point compression increase (57 was 4V... and used same carb as later models).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarlinSteve Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 7:26am
The 327 was introduced in the 57 Rebel and also had solid lifters.





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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucas660 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 2:34pm
Originally posted by FSJunkie FSJunkie wrote:

It appears to be coated in Glyptol inside, which would indicate that it has been rebuilt at some time as well.  

I have had 2 287's apart and they were both painted in the valley area in what appeared to be Glyptol or some kind of red oxide paint.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzzman72 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 4:21pm
Originally posted by farna farna wrote:

(57 was 4V... and used same carb as later models).

You're partly right. The '57 327 was only available with 4-barrel carburetion. BUT it uses the CARTER WCFB, model 2593-S or 2593-SA. The '58 and up 4-barrel was the Holley 4160 [pretty sure they all had vacuum secondaries, and weren't mechanical secondaries like the 4150].

But the carb DID change between '57 and '58-up.


Edited by Buzzman72 - Jan/18/2018 at 5:58am
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