403 Oldsmobile

[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.

[Jeff Stout]

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.