No, and before this thread runs completely wild, there is little in common between the BDA and the Toyota 4age other than bore, stroke and valve sizes. That the 4age was a 'mass produced BDA' is a rumour (read: assertion) that may cheer some and not others (BDA owners eg) and no more than that.
I quote from club4ag.com:
"Contrary to a false assumption that the 4A-G is a copy of the Cosworth BDA, (coincidental â€¹Ã…â€œAÂ¢Å¾Â¢ series designation on both engines). There are little, if any, interchangeable parts between the two engines, outside of maybe some nuts and bolts... The Cosworth 4-valve design started life using the Ford Cortina engine block, with its distributor located on the side of the block and progressed to belt driven Escort engines. The basic block was, like the current formula Atlantic engine, based on a production block. Most of the Ford blocks that Cosworth used could be taken up to 2 liters. The 4A-G is limited to around 1.6 liters maximum, because of the deck height and bore spacing. The included valve angles for the BDA is 40â€šÂ°, along with what has become a Ken Duckworth design feature, and that is the use of a separate camshaft tray. To the contrary, the 4A-G has a one-piece head with the camshaft saddles cast right in. The included valve for the 4A-G is 50â€šÂ°, more similar to the earlier Alfas or other Italian designs of the 70Â¢Å¾Â¢s"
The BDA head has downdrafted ports, different coolant galleries. It is important to distinguish between designed-for-purpose competition engines and production units, however good they may be. The BDA head and the full-spec BD series derivatives are pared-to-the-limit technical works of art and thoroughbred race engines and always will be.