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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 12-24-2011   #1 (permalink)
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Default 1965 mustang 6 cylinder, Cylinder Head casting number

Hello everyone and merry christmas!!

My issue is I have a 1965 mustang 6 cylinder 200, that im getting rebuilt. When the shop took my heads off they showed me 1) my heads were cracked and 2) they were surfaced to much before. So I've been looking for heads and I have found some but the guy from the shop told me I should find one that matches my casting number which is C50E-6090A. The heads I found were off a 1965 mustang 6 Cylinder 200 or so the guy tells me and have the casting number of C6DE-6090B

I want to know 1) how to read the casting number if anyone has this info?? 2) Does the casting number make a difference?? 3) If I could use these heads i found based off the info above??

Thanks and I'd appreciate the Help
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Unread 12-24-2011   #2 (permalink)
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C5 is 1965, C6 is 1966, it will work fine. Someone has milled the head to gain compression, either lost due to not being able to find the original head gasket which is a lot thinner, .027 and hard to find, or simply to increase compression ratio. Replacing with a newer, thicker gasket, new head will have to be milled to make up the difference in thickness or lose compression. Stock combustion chamber measures 51.5cc for 1965 200ci engine.
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Unread 12-25-2011   #3 (permalink)
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It may not be such a bad idea, to drop the compression a tick, since gas nowadays has a lower octane rating than gas back then which was 93-95 octane, which is premium today. I run regular in my 289 with 9.5:1 compression, and do not have any knock. My 2 cts. Good Luck.
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Unread 12-26-2011   #4 (permalink)
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Thanks for the help,

If I decide to go with these 66' heads will I still be able to use my same carburetor?? and will it run the same as if I the stock 65' heads on it?? Thanks for the help and I did find heads with the same casting number from a parts warehousebut they said it would cost me 250$ which I think is to expensive. Which is why im contimplating using these 66' heads which I can pick up for 50$
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Unread 12-26-2011   #5 (permalink)
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No problems using the 66 head.
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Unread 12-26-2011   #6 (permalink)
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THANKS!! thats good news to hear

When I go see these 66' heads should I take my stock 65' heads to make sure everthing lines up?
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Unread 12-26-2011   #7 (permalink)
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Can't think any reason why, but if it would make you feel better, go ahead.
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Unread 12-28-2011   #8 (permalink)
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Make sure to inspect the replacement head carefully. This head design is infamous for cracks between the valve seats and in the intake plenum. It took me 5 tries to find a good piece.
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Unread 12-28-2011   #9 (permalink)
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ok thanks a lot for the help
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