so i've been reading up on the LIM porting threads for the L36 and i've been wondering if any of the gains seen here could transfer over to the L27? obviously any smoothing and port matching is going to benifit any motor. the real issue is going to be porting the very long cross sectional runner where it meets the Upper manifold.

does anyone have a pic of the bottom of the L27 upper alluminum manifold (EGR-less) how about the gasket?

IIRC the manifold mating surfaces are about the same between the metal and composite manifolds.

x2, IIRC.

is the alluminum manifold a two peice like the composite one or is it all one peice?

Two piece.

just to specify here... the upper manifold is a two peice. like the composit. the outside and then an insert?

Oh, I think the upper is one piece. I thought you meant one piece like a pre-92.