Dunno. I'd take some kids modeling clay and stick a wad in the isc port and put in place both isc's (I'd wind in the pintle all the way on both first) and see if the larger pintle interferes with the fidle port or sits deeper/shallower than the stocker. I use this method to check piston-valve clearances. You get fairly accurate measurements if you install the old one first, measure the dimple bottom thickness, then install the new one and see if (a) it sits deeper (one bigger, deeper dimple) or (b) shallower, so you get a big, shallower dimple with the smaller, deeper dimple in the middle. This also checks the alignment of the different pintle with the port.