403 Oldsmobile - Page 2

Jim Kaekel · 01-20-2020, 04:32 PM

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

Quote:

Originally Posted by SSDiv6

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

Quote:

Originally Posted by rallye bob

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

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

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

Quote:

Originally Posted by Bunkster

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

Quote:

Originally Posted by Dave Noll

And?

No payoffs have been made....

Bob Shaw · 02-16-2020, 05:57 PM

Quote:

Originally Posted by SSDiv6

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

Quote:

Originally Posted by Bob Shaw

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?

01-20-2020, 04:32 PM	#11
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,226 Likes: 133 Liked 529 Times in 107 Posts	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. __________________ Jim Kaekel 3836 STK

01-24-2020, 09:46 AM	#14
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 372 Times in 129 Posts	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.

01-24-2020, 11:36 AM	#15
Bunkster Member Join Date: Aug 2002 Posts: 307 Likes: 0 Liked 43 Times in 10 Posts	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.