flow and velocity has been achieved pro engine builders report gains of 15-25 ... both worlds situation i 061040 world sbc motown single plane manifold flange ... coming soon world motown intake for vortec-style heads by the time you read this world ... new motown intake manifold for vortec-style heads p/n 061041 should be available it ... runners and is 100 compatible with gm s vortec style cylinder heads moreover it s a ... entire rpm range 061041 061050 world sbc motown single plane vortec-style ... manifold world sbc motown single plane manifold part # ...