Thru-transom headers

[james s]

Can anybody tell me where I can find thru-transom headers(wet, of course) for a 455? I have checked every manufacturer I know of, but still can't seem to find 'em. Do they exist, or do you have to have them custom made? Guess I can go to Sanderson if I have to!!!

[Cas42]

I went to Sanderson years ago with my first boat that had a 455. Be prepared to spend a few dollars.

[jim lee]

Rewarder has thru-transom headers for Olds 455. I talked to them about a year ago just to confirm this.
But these are -not- to be used for enclosed engines. (That's what they said)
Good luck!
-jim lee

[greatam]

Originally posted by james s:
Can anybody tell me where I can find thru-transom headers(wet, of course) for a 455? I have checked every manufacturer I know of, but still can't seem to find 'em. Do they exist, or do you have to have them custom made? Guess I can go to Sanderson if I have to!!!
I have a set of EDELBROCK logs, will work on stock 389-455 heads. They are from my 455 Pontiac, but when I went to aluminum heads, had to get new headers. They have been in my garage on the shelf, all wrapped up since 1997. They were originally on a 389 Police Interceptor motor, which was the origanl motor in my 1967 jet boat. Will these work for you? My husband just reminded me we also have a set of logs for a 455 Olds. Came out of my 74 Sanger. Have to go find those to let you know what brand they are. If you are interested in either set, email

[GlastronGuy]

Here is the reply I received from Rewarder. I also have a 455
"Yes I make a header for this only in an open motor compartment. 2 1/4
primary into 4" collector. Cost $750.00. Thanks................Jim"

[james s]

CAS42, thanks. Yea, I would expect Sanderson's to be pricy since alot of their equipment is custom.
Jim Lee and GalstronGuy - I thought I saw Rewarders offered for the Olds, but they don't list it on their web site. I realize I would have to remove my engine cover, but at least I know where to start looking!! Thanks all!!