350 sbc 1 piece rear seal 4 bolt main - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-07-2011, 08:41 PM
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350 sbc 1 piece rear seal 4 bolt main

Right now I have a 89 350 2 bolt main, roller motor in my 81 Z28 . I want to build a 383 my question is did GM build a 350 4 bolt roller motor 1 piece rear seal ? If they did what did they come in , what are the casting numbers ? Any help would be great.

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Old 07-07-2011, 09:19 PM
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Yes they did. Most commonly in the 1996 and up Vortec engines. The 880 casting can be a 2 or 4 bolt main. However, if your not looking to make over 500 horsepower a 2 bolt block is all you need. For a little more insurance you could add ARP main cap studs. I`ve never seen a small block fail through the main caps.
Here`s the list:
http://outintheshop.com/faq/casting/castings2.html
Keep in mind, some blocks accepted both flat tappets and roller. But some came with flat tappets with no provision for the roller cam.
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Old 07-08-2011, 04:05 AM
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500 hp already there

I'm already making about 500 with my 350 . That's why I want to build a new short block scared what I have is going to let go . The motor I run now is starting to show a little to much leak down time to freshen up. No better time to build a 383. The car is a 81Z-28 street car 12.6 in the quarter.
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Old 07-08-2011, 04:11 AM
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12.6 and 500 horse, hmmm. That could be a low 11s car with that much hp.
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Old 07-08-2011, 02:45 PM
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1989 vs 96

Will my top end out of the 89 fit into the 96 ? I think the car has low 12s in it If everything is right . 11s I don't think so full body 81 z probably 3500 or 3600 lbs with no suspension up grades HP has never been tested just guessing quite possible I am not making 500 .
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Old 07-08-2011, 09:03 PM
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The 4 bolt 1 pc seal blocks are found in HD 2500's and 3500's for sure.
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Old 07-09-2011, 12:35 AM
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Yes your top end will bolt right on. The only difference in the vortec engines was they also have a factory windage tray and a different oil pump but a older original oil pump will still bolt on. The Vortec block doesn`t have a coolant bypass hole, but all you have to do to remedy this is drill a 3/16 in the outer parimeter of the thermostat. Also with a Vortec block it requires a special timing chain, if a double roller is used it`ll make contact with the block. Here`s the correct timing chain for Vortec blocks:
http://www.summitracing.com/parts/CL...n/?prefilter=0
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