[Dragncar]

I run the Nappa Gold filter for a early 60s big car in my 69 GTO. Its longer so it has more capacity and filter area. Fits with my Hooker round port headers.
That said, its a fine filter for what it is. I know of no one who has run a 455 as long as I have and as hard as I have and never hurt a thing.
But, if you want problems plug the by pass. foolish. You are asking a filter to do more than it can. It would take more than 2 filters set up to get it all under every engine condition. Pontiac engineers were not stupid.
Seen too many guys have problems with plugged by pass with just a standard sized filter screwed on. Don't care what they say the filter flows. Know of guys who blew those big long tall deck BBC filters off too.
Most of us drag race and oil never really gets dirty before its changed.

[mgarblik]

Originally Posted by Dragncar

I run the Nappa Gold filter for a early 60s big car in my 69 GTO. Its longer so it has more capacity and filter area. Fits with my Hooker round port headers.
That said, its a fine filter for what it is. I know of no one who has run a 455 as long as I have and as hard as I have and never hurt a thing.
But, if you want problems plug the by pass. foolish. You are asking a filter to do more than it can. It would take more than 2 filters set up to get it all under every engine condition. Pontiac engineers were not stupid.
Seen too many guys have problems with plugged by pass with just a standard sized filter screwed on. Don't care what they say the filter flows. Know of guys who blew those big long tall deck BBC filters off too.
Most of us drag race and oil never really gets dirty before its changed.

Agree, I did not mean to recommend blocking the bypass in my earlier post. I would much rather have dirty oil, or even oil with a little bushing material in it lubricating my bearings than NO OIL in the bearings. I don't think it is wise to block the bypass in any engine that will see street use.