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-   -   403 Oldsmobile (https://classracer.com/classforum/showthread.php?t=75218)

Jim Kaekel 01-20-2020 04:32 PM
Re: 403 Oldsmobile
 
Add a couple of others- Mike Mayhew ran a '77 Cutlass with a 403 a few years back and Mike Moyer ran a Olds 403-powered Firebird as well.

rallye bob 01-23-2020 06:10 PM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by SSDiv6 (Post 606430)

All 403 blocks are windowed; there were no solid web 403 Oldsmobile blocks.
This is fact...

Years ago a gentleman offered a million dollars if you could come up with a solid main web (SMW) factory Oldsmobile 403 block....

Dave Noll 01-24-2020 01:53 AM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by rallye bob (Post 606732)
This is fact...

Years ago a gentleman offered a million dollars if you could come up with a solid main web (SMW) factory Oldsmobile 403 block....
And?

HP HUNTER 01-24-2020 09:46 AM
Re: 403 Oldsmobile
 
Those windows can be patched and welded up........You would have to be a hard core Olds person to want to bother. When you take a good look at a 455 block, I'am sure the bore and main housing bore size of the 403 block looks darn tempting.

Bunkster 01-24-2020 11:36 AM
Re: 403 Oldsmobile
 
In the eighties, there were scads of 307 cars being beat to death all over the country. Those were windowed too.

They held up well. They weren't nearly as fragile as some thought.

Jeff Stout 01-24-2020 12:17 PM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by Bunkster (Post 606788)
In the eighties, there were scads of 307 cars being beat to death all over the country. Those were windowed too.

They held up well. They weren't nearly as fragile as some thought.
Im running a 307 window right now. Im only a little nervous as Im not making big power , but in the beginning I was crossing finish line at 7000 and was waiting for kaboom. Now things are more inline and rpm's are at 6300. I feel allot better now. Oil looks great and pressure is still the same.

rallye bob 01-27-2020 03:47 PM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by Dave Noll (Post 606762)
And?
No payoffs have been made....

Bob Shaw 02-16-2020 05:57 PM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by SSDiv6 (Post 606430)
Pete Kost drives Bill's former Oldsmobile and it is still powered by a 403.
It is one of the most successful 403 powered Oldsmobile's in Stock eliminator wining many races and setting many records

All 403 blocks are windowed; there were no solid web 403 Oldsmobile blocks.
According to the late Joe Mondello there were about 2500 solid main web 403 engines built. Most of them were in 1977 Buick station wagons. Block casting number is 557265-4A or 554990-4A. My son has one in his Cutlass.

SSDiv6 02-17-2020 11:00 AM
Re: 403 Oldsmobile
 
Quote:
Originally Posted by Bob Shaw (Post 608317)
According to the late Joe Mondello there were about 2500 solid main web 403 engines built. Most of them were in 1977 Buick station wagons. Block casting number is 557265-4A or 554990-4A. My son has one in his Cutlass.
Bob,
I have built engines with both casting numbers and the mains are hollow. Has your son torn apart his engine and looked at the block?


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