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Strange Engine Casting #?

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Old Aug 27, 2005 | 04:15 PM
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Default Strange Engine Casting #?

I know my engine is not stock, the guy I bought the car off of said it was a 427 thats in the car. He also said that the engine is a factory replacement. I looked at the casting number and it says GM 6, I think there are numbers after it but theres a space after the 6 and nothing but faint marks (could be just small scratches). Sorry don't have pics. How can I tell if it is a 427?

Last edited by Mllrvette1968; Aug 27, 2005 at 05:30 PM.
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Old Aug 27, 2005 | 05:32 PM
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ttt
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Old Aug 27, 2005 | 06:47 PM
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Originally Posted by Mllrvette1968
How can I tell if it is a 427?
By the size and 7 valve cover bolts...265-400 small blocks have 4 valve cover bolts.

The casting number is located just in front of the bellhousing. Don't be surprised if you have a 396/402 block.

Last edited by GDaina; Aug 27, 2005 at 06:52 PM.
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Old Aug 27, 2005 | 07:07 PM
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Thanks, I know I have more valve cover bolts than 4, could that be a 427 and bigger? When the valve cover is removed i noticed i have some vary sized holes between Valves, and that they are similar sized on each head, and are inbetween same valves. Should I be worried? Sorry Big Blocks are new to me. I know the engine needs work. I bought it without it running and missing some components. I was looking for a project.
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Old Aug 27, 2005 | 07:50 PM
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ttt
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Old Aug 27, 2005 | 08:07 PM
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ttt
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Old Aug 27, 2005 | 08:14 PM
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are the valve's like this --------- or offset???
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Old Aug 27, 2005 | 08:18 PM
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no need for the ttt's...someone will read your thread and reply.

The holes could be pushrod holes if the pushrods are not installed
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Old Aug 27, 2005 | 09:09 PM
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comp, not sure what you mean?

gdaina, thanks, still trying to get the hang of this(forum)

The holes are between the valves, and the heads are fully assembled. holes located at the front of the head, in the center is a smaller one, and at the end. identical to the opposite head's holes. But also looks like they were made, some small jagged edges.
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Old Aug 27, 2005 | 09:11 PM
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comp, sorry just picked up on that. they are offset, I guess because they look like this -_-_-_-_ or vis versa
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Old Aug 27, 2005 | 09:21 PM
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oil return holes and jagged edges are flash castings...me tinks you worry too much
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Old Aug 27, 2005 | 09:25 PM
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maybe so, but I want to make sure this guy didn't pull a fast one on me. Thanks for the great info, I'll sleep soundly tonight
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