mopar big block high performance manifolds ?

[Douglas]

mopar big block high performance manifolds ? can someone chime in here on these. i currently have stock manifolds and wanted to know more about the stock hp manifolds instead of headers on my 67 fury.

 

[1970FuryConv]

For 1969 log manifold outlet diameter was 2.00". HP exhaust manifold outlet diameter was 2.25"
HP exhaust manifolds have better shape and flow IMO.
Because of the up sweep to HP manifolds, they will burn valve cover paint if a barrier gasket is not used. Exhaust manifold gasket MS 90425 will prevent.
Also, HP exhaust manifolds require a special bolt kit to install. They look cool when done. Hadn't learned my lesson about MS90425 when I took these photos

 

[CBODY67]

There were also some OEM orange silicone valve cover gaskets from Chrysler too. Heat shield is a good idea, on the rh side.

CBODY67