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Old 05-18-2009, 08:20 PM
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Main bearing webs

I have no idea what main baring webs are.Can someone post some pics of what they look like and give a description of what they are.Ive also been doing some research on the olds 403 and found out that I may have one with solid main webs.I have the correct casting # on the block and have the matching 4A heads but dont have the block ID because it seems its been worn out.Thanks. Oh yeah,the block year is 1977.

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Old 05-18-2009, 08:25 PM
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The main webs are the casting material that extends down from the camshaft area of the block to support the crank, that is machined and drilled for the main bearings, main caps, and bolts. They may also be refered to as main bearing bulkheads.
Try this site www.realoldspower.com

Last edited by ericnova72; 05-18-2009 at 08:27 PM. Reason: more info
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Old 05-18-2009, 09:14 PM
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Quote:
Originally Posted by Mr.403
Ive also been doing some research on the olds 403 and found out that I may have one with solid main webs.
You don't. The solid main web 403 is an urban myth. In the 30 years since these blocks have been cast, not ONE photo of a 403 with solid main webs has ever been taken. Mondello may have had some pre-production blocks, but every single production Olds block cast from 1977-on had windowed main webs except for the diesel blocks. This includes the 260, 307, 350, and 403.
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Old 05-18-2009, 09:59 PM
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Quote:
Originally Posted by joe_padavano
You don't. The solid main web 403 is an urban myth. In the 30 years since these blocks have been cast, not ONE photo of a 403 with solid main webs has ever been taken. Mondello may have had some pre-production blocks, but every single production Olds block cast from 1977-on had windowed main webs except for the diesel blocks. This includes the 260, 307, 350, and 403.
Ive heard your name somwhere. Im new to this stuff.Anyways, thanks for clearing things up for me.
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Old 05-19-2009, 05:59 AM
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Quote:
Originally Posted by Mr.403
Ive heard your name somwhere.
Probably at 442.con
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Old 05-19-2009, 07:19 AM
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Interesting reading HERE regarding the 403 main webbing.

When these 403's first started hitting the 'yards, I and my cohorts started looking- and I mean LOOKING- for a solid 403.

That was ca. 1987 or so.


To this day, none of us has EVER found one. Between us all, we've prob. opened up 200 of them, at least...

A main "halo" girdle to tie the bulkheads together along w/balancing the rotator will allow the engine to make 500-plus HP reliably, IMHO.
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Old 05-19-2009, 03:33 PM
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yeah,, this subject is amusing always haha

i found on a page somewhere else on the net that claimed that some 403 blocks had more web material(smaller web windows) than the typical ones had.

and so apparently they were mistakenly thought to be solid main web blocks.

supposebly in some wagons in '77 and trailer package ones. even listed casting numbers of these "solid main webbing" blocks

i posted the url to the page where i found that info, in another current 403 post on this site.

ive owned a 77 electra which had the 403 in it and it was a strong smooth runner lots of torque i miss it alot and it had low miles for a 77 even. shoulda kept it... was a very clean straight solid car i only gave 300 for it even., dammit.. i eventually put a pair of chevy truck ralley 15x8 wheels on it and 31 x 10.50" tires on it that BARELY cleared the outer wheel tub lips haha. it was great for winter time this way,. i still have the original buick full wheel covers set from this car. i remember the 8 track set in it still worked even.




Last edited by fast68; 05-19-2009 at 03:42 PM.
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