Enya .35 5224

In previous posts regarding this engine I discovered there was a square intake version.

I have a 5224 .35 here with a round intake. I have both the r/c carb plus the cl venturi and NVA.

I also noticed in the previous referenced eBay item (New in box 5224 square) that it came with a second head.

What are the differences in the square v. round intake and what was the purpose of the alternate head?

mybe only release date?? since both are same model number?

Thanks

The square intake Enya was supposed to be an all purpose engine, so it was supplied with 3 different size venturis and 2 heads to give 2 different compression ratios. Supposedly you could mix and match the parts to make the engine suitable for any application.