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72 Corvette 454 Exhaust Manifold date code question

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Old Jul 12, 2010 | 12:43 AM
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1972corvette454
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Default 72 Corvette 454 Exhaust Manifold date code question

Need your help please.
My Passenger side exhaust manifold the end piece that bolts to the cylinder head is broken off. Need to know the difference between my manifold and this GM1T which stands for? Is this for a 71 Corvette 454?

Last edited by 1972corvette454; Jul 12, 2010 at 01:01 AM.
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Old Jul 12, 2010 | 07:18 AM
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GM1T is some kind of casting code for the mold I believe. The other looks like G 14 8 which is the date code July 14 1968.
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Old Jul 14, 2010 | 11:07 PM
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1972corvette454
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From: Oakville Ontario CANADA
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Check this out then, this date code does not make sense


Originally Posted by markdtn
GM1T is some kind of casting code for the mold I believe. The other looks like G 14 8 which is the date code July 14 1968.
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