Is there any rhyme or reason which drive flange gets installed on rebuilt water pumps? Every WP for a 250/230 I have ever bought has had the dual-pattern flange, but I have a 292 WP w/ the 1 1/4" bypass hose that has the dual pattern and one with the smaller bypass that has the I6-specific pattern only.
I would prefer to have a dual pattern flange on the WP with the smaller bypass because of the ease of finding fan spacers with the small block pattern so I can get my fan just right in the shroud. Is it just luck of the draw when buying a new pump? Or would I be better off just drilling and tapping the one I have now?
Thanks.