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Old 03-15-2009, 04:43 PM
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Differnce in BB chevy blocks

I have a 454 2 bolt main out of an 1983 truck that I was going to rebuild but I found a 4 bolt main 1996-2000 454 4 bolt main i can get cheap.

What wil be different between these block if any differnces?

Will I have to buy different parts if I buy the block?

the engine will be a 496 what im done

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Old 03-15-2009, 05:00 PM
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As built the differences are. The early block has two piece rear oil seal. The oiljng system to the mains runs down the side of the block. Front to rear just above the oil pan. Lifter bores are for std. Chevrolet lifters. The water to head holes in the block deck are round. If from a pickup truck will be a "short deck". 9.800.

Later blocks are one piece rear main seal. The oil pan is different. The crank is different. The balancer and flywheel will fit an early engine but are balanced different. The main oil system runs the length of the block next to the cam. The lifter bores are taller for factory roller cams. The water deck passages are very large. This requires different gaskets to use certain heads. The cylinders are thinner than the old style blocks. These are available in short and tall deck. 10.200"
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Old 03-15-2009, 05:16 PM
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If the newer one is a Gen 6 it will also have a different timing cover but you can drill and tap the block to accept the gen 5 cover, the 5 or 6 as stated above has a one piece pan gasket that won't keak unless the bolts fall out. As far as the crank you can put an early one in the gen 5 or 6 with a RMS adaptor that is no big deal to put in. I like the better oiling system on the Gen 5/6 and they are easy to oil restrict under the rear cam bearing if you run a solid cam or solid roller. I run between a .040-.060" hole in the restrictor. Either one will make you throw rocks at the next SBC you think about building. I started 20 years ago with a 375 HP 396 and never looked back as far as going fast not just going to get groceries.
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Old 03-15-2009, 05:29 PM
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I would most lickly better off with the older one since the cyalder walls are thickler right ?
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Old 03-15-2009, 05:37 PM
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i have heard about restricting and olds engine, but not so much a chevy what are the benefits of doing so i will be running a solid roller cam
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Old 03-15-2009, 05:59 PM
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I have not had any problems from a Gen 5-6 up to about 950 HP after that they start walking the main caps around and also get "goose eggs" in the cylinders when you hone them for a freshen up telling you the block is moving around. I would build what you had the most parts for. As far as the restrictors they keep you from pumping the pan dry and burning up the rod and main bearings, The only BBC I did not restrict had front main issues until I added restrictors. I hate the screw in ones in the rear cam lifter gallies the O rings get chewed up when you are installing them and they are a waste of time after that.
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Old 03-15-2009, 06:12 PM
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only parts I really have is a 4.250 stroke eagle crank shaft

the engine will be a street engine , do you think the restreictor are nessasary?
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Old 03-15-2009, 06:43 PM
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I restrict any solid cam BBC on the street I run a 1/16" hole.
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Old 03-15-2009, 08:03 PM
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Under on circumstances should you use oil restrictors on a big block Chevy.The extra oil helps to lubricate the lifters and keep the valve springs cool.The use of restrictors is something that could be classed under "Old Wifes Tales".
Guy
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Old 03-15-2009, 08:09 PM
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and lack of fuel pump boss on the late blocks
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