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#1
01-16-2001, 10:18 AM
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To anyone who has a 350 or 400 in a 1976 car or anyone who has a 1976 350/400 block, what is the block code and what body was it from/in? Please let me know.
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#2
01-16-2001, 10:18 AM
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To anyone who has a 350 or 400 in a 1976 car or anyone who has a 1976 350/400 block, what is the block code and what body was it from/in? Please let me know.
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#3
01-24-2001, 11:17 PM
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i have a book with all the 76 block numbers in it. The list is quite long. Is there a particular # you need to know about? Txbobcat65
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#4
01-26-2001, 01:38 PM
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Thanks for the reply. I have all the block designations pretty much down but there are a some that are obscure. I have a 76 Technical Bulletin which shows all the block codes for those blocks in which the balancer has been deleted and a "hub" in it's place. All the block codes listed have no specific designation. The are all X and Z code blocks. Have any nfo on those?
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#5
01-26-2001, 08:17 PM
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I have a '77 400 engine with a hub instead of a balancer. I was considering replacing the hub with a balancer when I rebuild it,but I am not sure of this hubs purpose.Are these engines balanced differently than a regular engine with a harmonic balancer or what's the deal?
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#6
01-27-2001, 10:45 AM
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According to the 1976 Service Bulletin which introduces the new design, the "crankshaft pulley hub, timing chain cover and engine timing indicator" are not interchangable with the other units. So, you'd have to find donor parts for all three.
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#7
01-27-2001, 01:25 PM
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yes, I have to change the timing cover as well because a balancer would interfere with the pointer on the cover. The pointer can also be removed. It is bolted on to the cover not cast in as on the harmonic balancer cover.Do you think there are any gains to be had by using a balancer instead of that solid hub. I kinda thought a harmonic balancer was there to reduce crankshaft harmonics. How do they justify not using one?
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#8
01-27-2001, 03:44 PM
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Well, also according to the TSB, the hub was only used on auto trans cars that with lower shift points. The balancer was installed on any manual trans, police/towing package or higher rpm upshift cars. If it were me, I'd install the harmonic balancer rather than trust a non-dampening hub.
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#9
01-27-2001, 09:11 PM
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rocky, most of the "hub" engines that i've found have been in g/p's and firebirds while the balanced engines have been in fullsize cars[ bonnies,safaris,ect]. isn't this just the opposite of what the tsb states? makes a lot of sense doesn't it? sounds like the hub setup was a money saving effort on gm's part.mike
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#10
01-28-2001, 01:18 AM
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I personally can't think of any other reason to leave a balancer off an engine other than to save money or cause a durability problem. I certainly hope that these weren't the either of the reasons!
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