A460 Exhaust port spacing

I made my zoomies off my A460 Ford Motorsport heads....Well...today i was trying to bolt them up to the TFS A460 heads on the engine in my car...And guess what?? The TFS heads from end bolt to end bolt are 1/8" narrower than the Ford Motorsports. You probably wouldn't notice it on a set of headers with slip in tubes,but I welded straps on these zoomies for support. I'm wondering if it would be better to cut them apart and reweld the straps or to ream the flanges out?? This stuff is really fun!!! Been remounting everything to get this engine in ..

Reaming the flanges out would probly be easier as long as the port alignment is good, and you have enough flange.

You should have called Uncle Charlie, because you haven't been paying attention Anyway, I've posted it a dozen times if I've posted it once,,,,,, but the old Ford Motorsports A-460 heads and the old TFS A-460 heads with the "block" cast lettering,,, had the Chevy bolt pattern on Ford bore centers of 4.900".

The current TFS A-460 heads, with the ends milled flat and smooth, with engraved lettering, have the Chevy exhaust bolt pattern AND is on Chevy bore centers of 4.840". Therefore, it can take a one piece Chevy header gasket. That's your difference and is the cause of your problem.

Charlie Evans

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I'm glad to know the difference now..It ain't no big deal either way. May just ream the flanges, I've got Jon Thee flanges and have plenty of room on them ,it won't take much to clear them . I can move them over enough with a screwdriver to line them ,but don't like that much pressure on the bolts being that they are in aluminum..

56Tbird wrote:I'm glad to know the difference now..It ain't no big deal either way. May just ream the flanges, I've got Jon Thee flanges and have plenty of room on them ,it won't take much to clear them . I can move them over enough with a screwdriver to line them ,but don't like that much pressure on the bolts being that they are in aluminum..

Dan I would rem the holes alittle it might be tuff the 1st time but after you heat them up a few times they should not have that much pressure on the bolts as the heat will let the metal expand alittle.I had the same thing happen on the header I put on my 69 F100 after I had to make some mods to them after they was run awhile I don't have to pry on them to get them on.

You give me 2 minutes alone with it, and it'll fit

Barney wrote:You give me 2 minutes alone with it, and it'll fit

Come on down Killa!!!

I think I'd rather just go ahead and ream them to fit these heads too. That way if I have to put the other engine in ,they'll fit

Dan,

I try to use header studs and then serrated flange nuts on my stuff. That way you don't have to worry about crossthreading a bolt. I think I have a case of those header studs on the shelf and they are grade 8 with the small internal hex head. Switched to studs when I got tired of heli-coiling the header bolt holes in the heads.

Charlie

Barney wrote:You give me 2 minutes alone with it, and i'll fix it

Thats what SHE said

Dan,I also like the stud deal on mine.And it also makes the headers alot easier to install. If you need a new set of studs let me know and I will send you some. Of course you know mine will be VERY expensive to YOU.

3/8" set screws made nice cheap studs.

bbf-falcon wrote:

Barney wrote:You give me 2 minutes alone with it, and i'll fix it

Thats what SHE said

Dan,I also like the stud deal on mine.And it also makes the headers alot easier to install. If you need a new set of studs let me know and I will send you some. Of course you know mine will be VERY expensive to YOU.

A little lube and sweet talkin.

Barney ,it took a little longer than 2 minutes for me.....I guess I'm just slow Maybe that's why I missed Professor Charlie's class on the Aheads too Send them studs my way Rickie!!

Ah ight The ones w/insert for allen wrench coming your way. What length do ya prefer sir

How long's yours Rick?? I don't want for mine to be shorter than yours But , I'm not sure I have room down there to clear the ones like Harold"s

you guys getting out the ruler again? lol no measuring in cm's

Easy now!!

[quote="56Tbird"]How long's yours Rick?? I don't want for mine to be shorter than yours But , I'm not sure I have room down there to clear the ones like Harold"s [/quot

I resemble that remark, if you would have stayed awake, we wouldn't be having this discussion.

HE WERE DRUNK HAROLD,HE WERE DRUNK. DAVE D.

header tubes are larger than exhaust port ,, no big deal . now if sloting the bolt holes moves the tube to cover the exhaust port .. then