460 Block differences

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Mar 20, 2007 | 11:12 PM

Witty73

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From: Minnesota

460 Block differences

Ok guys, could spend hours searching the forums for this, but I guess I will ask instead. My 76 460 block is at the machine shop, and he is taking his sweet old time with it. I have an 89 or 90 block sitting in the shed. The machine shop is an hour away. Therefore, I am wondering if the block is the same or not. I would like to bolt it to my C6, and use if for mocking up purposes in my project. Any thoughts? Thanks for any help in advance.

Mar 21, 2007 | 08:35 AM

darrin1999

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From: fargo, nd

bellhousing pattern is the same, oil pan should be the same if the 76 was out of a truck or has the truck pan swap kit on it, so as far as mock-up its the same, but in 1979 the engines went external balance, and in 1988 they went fuel injection (some 87 but all 88) and changed the intake and exhaust arrangement, so mockup of exhaust wouldnt work, but otherwise not much difference... the cylinders are slightly longer on the 79+ blocks so theyre better for strokers, but thats all covered up by the oil pan... so for mock-up purposes it doesnt matter... thats really all the differences

Mar 24, 2007 | 07:47 AM

Witty73

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From: Minnesota

Thanks Darrin, that is exactly what I wanted to know. I need to mock up my motor mounts due to the fact I just finished welding in an MII kit for fatman fab. I knew most of the differences you mentioned, just wasn't sure about the motor isolater mount specs. I figured they were the same.....but you never know.

Mar 24, 2007 | 11:25 AM

Paul Kane

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Quote:

Originally Posted by Witty73

My 76 460 block is at the machine shop, and...I have an 89 or 90 block sitting in the shed. The machine shop is an hour away. Therefore, I am wondering if the block is the same or not. I would like to bolt it to my C6, and use if for mocking up purposes in my project. Any thoughts? Thanks for any help in advance.

The 1989 block is casting number D9TE-AB and the 1976 Block casting number is D1VE-(various suffix, likely D1VE-6015-A2B). The crankshaft from the early block will not drop into your late block unless some clearancing is done to the crankcase of the later block. Other than that, the external dimensions are about the same between the two blocks and your early heads will fit the later EFI motor's block. The deeper cylinders in the later block are just that, but the extended length is added downward toward the crankcase so the block's deck heights (crank centerline-to-cylinder deck) are the same between the two blocks.

For a good primer on block specifics, click HERE.

Paul

Mar 27, 2007 | 03:00 PM

Witty73

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From: Minnesota

Thanks Paul, I am building a pretty healthy 460 for the street, and mainly concerned with mocking up motor mounts on the frame right now. don't want to go to all the work of painting everything, only to grind off and re-weld later.

Witty