?????? EXHAUST MANIFOLD butterfly flapper valve thing question ?????????????

[rav440]

is there a need for the valve flapper thing on the passengerside HP exhaust manifold if your runner a little better than stock cam , 750 DP carb bigger valve heads 2.14/1.81 and a hotter than stock ignition ? the way im thinking it will restrick exhaust flow . i know it is there for a reason . but what ?



thanks RANDY 

[chgr500]

It's designed to limit exhaust flow when ambient temperature is cold....on a stock intake manifold it would allow exhaust gas to flow back up and through the centre of the manifold to help warm the fuel....as the engine warms up the flapper will open to fully allow the exhaust to have unrestricted flow......cold fuel charge doesn't burn too well...depending on your location and if you drive your car in winter months or cold weather I would keep it....of course I live in the NORTH 

[Just 6T9 CHGR]

I took mine out & welded the holes shut....

[resq302]

I took the flapper valve apart and removed the actual flapper mainly because I was having an over heating issue and have heard that these could fail or rust in the closed position causing an over heating condition.  I ground off where the tack welded areas were and smoothed out the shaft and reassembled it to give it the "correct factory looking appearance".

[y3chargerrt]

Brian, Do the judges at Hershey know this??? 

[Just 6T9 CHGR]

Brian, Do the judges at Hershey know this??? 

Ohhh shizzy they will now


muahhhaah   

[694spdRT]

I took mine out & welded the holes shut....

Same here.

[bill440rt]

I rebuilt mine with the rebuild kits that are available in my '68 & '70. Works good as new.

[resq302]

Brian, Do the judges at Hershey know this??? 

Err....Ummm..... I don't know what you are talking about....   Its in there..... I swear it is.

[HeavyFuel]

I rebuilt mine with the rebuild kits that are available in my '68 & '70. Works good as new.

Do you remember your source for the rebuild kit?

[Nacho-RT74]

I rebuilt mine with the rebuild kits that are available in my '68 & '70. Works good as new.

Do you remember your source for the rebuild kit?

dunno if same source and dunno if same kit, but maybe this:
http://www.bradsnosmopar.com/nos7038exman.html

[69chargeryeehaa]

On my manifolds (440 with HP), i just removed all the flapper system, and got a long bolt and nut with some copper washers, put it right thru the manifold, and called it a day, that way i stopped the leaking of exhaust, and didn't render the manifolds useless if i ever did want to re-install the original pieces!!

[OldGuy]

I've got the exhaust manifold off of my 383 - so, how do you get the flapper out without cutting the shaft? - is it supposed to slide through the flapper?  Which end of the shaft on the outside of the manifold do you work with?