Speedmaster alloy port sizes

[vghoon]

Can someone tell me what port size the SM Alloys have , Will a ld4b intake work ?

 

[TurboGLH]

I can tell you the cnc versions are gasket matched to the larger 340/360 gasket, not sure about the as cast version.

 

[toolmanmike]

The answer should be no. The LD4B as you know is the small 273/318 port size. The Speedmasters are 340/360 sized ports.

 

[Wyrmrider]

going from smaller to larger works
gasket matching sorta sucks as that's not where the restriction is but you can pick up some if intake and head line up AFTER installation

 

[318willrun]

work? yes.

 

[MOPAROFFICIAL]

going from smaller to larger works
gasket matching sorta sucks as that's not where the restriction is but you can pick up some if intake and head line up AFTER installation

Common wall is thee most important part to line up. I cant stress this enough.