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Old 08-31-2017, 04:51 PM   #1
jimTN
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Default C91A6050 Canadian heads

I have a C91A 6050 and C91A 6049 set of alum. heads. The appear to be the real thing, not USA made racing HC heads. Are the Canadian heads higher compression or 6.5 to 1.
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Old 08-31-2017, 04:53 PM   #2
42merc
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Default Re: C91A6050 Canadian heads

Not high compression.
Standard low comp Ford.
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Old 08-31-2017, 07:26 PM   #3
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Default Re: C91A6050 Canadian heads

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Originally Posted by jimTN View Post
I have a C91A 6050 and C91A 6049 set of alum. heads. The appear to be the real thing, not USA made racing HC heads. Are the Canadian heads higher compression or 6.5 to 1.
High compression heads had "AS" in the prefix.
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Old 08-31-2017, 08:03 PM   #4
JSeery
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Default Re: C91A6050 Canadian heads

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High compression heads had "AS" in the prefix.
Kube, are those what are sometimes referred to as "Denver" heads?
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Old 09-01-2017, 07:34 AM   #5
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Default Re: C91A6050 Canadian heads

Yes AS heads were commonly referred to as Denver heads.
Martin.
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Old 09-01-2017, 03:51 PM   #6
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Default Re: C91A6050 Canadian heads

Were the "AS" heads made in aluminum and steel?
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Old 09-01-2017, 04:06 PM   #7
Bruce Lancaster
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Default Re: C91A6050 Canadian heads

AS heads are iron. The C in the PN designates Canadian manufacture...Some Canadian aluminum heads had slightly higher than irn CR's, probably just enough to compensate for the slight power loss. There is a Canadian service bulletin page listing CC's An CR ratings for nearly all USA and Canadian heads from about '32-49
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Old 09-01-2017, 04:12 PM   #8
Kube
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Default Re: C91A6050 Canadian heads

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AS heads are iron. The C in the PN designates Canadian manufacture...Some Canadian aluminum heads had slightly higher than irn CR's, probably just enough to compensate for the slight power loss. There is a Canadian service bulletin page listing CC's An CR ratings for nearly all USA and Canadian heads from about '32-49
Some AS heads were aluminium.
I have a set of 99AS heads, NOS, that are aluminum. According to the authentic documents that remain with this vehicle, they were were ordered (originally) to be installed on my '40 convertible (factory Merc. engine). It took me a LONG time to locate that set.
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Old 09-02-2017, 10:45 AM   #9
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Default Re: C91A6050 Canadian heads

I have a 40 convertible that has aluminum heads made in Canada with C7RA 6050 B.I was a ford partsman in the 60s and early 70s and understood that was an engineering number,C for decade 60 and 7 was the 7th year and 6049/6050 was the basic number cylinder heads.
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