The WD-45's came in 1 and 2 at Plain City, Ohio in the 5,000lb class....!!
They are running 4" and 4 1/8" bores and stock strokes... One said he was running WD pistons in his WD-45 to raise compression....remember, the WD-45 has 1/2" more stroke than a WD....!! They had MORE than enough power, too..!! Running stock mufflers...!! Remember, you can gain at least 10% more airflow with contoured valves, and Multi-angle contouring below the seat... Good luck..!! Ron.