The evolution of the 13BREW?
 

I'm in need of some clarification. I read some time back on this forum that the 13BREW underwent some modifications in it's later JSPEC years. Specifically, the coolant passages were enlarged? but I cannot remember the details of when this change took place or if this change was actually made? I believe there were other improvements made but I honestly don't remember.....

Please limit your replies to factual information and list your source if possible.

thanks gentlemen,

never heard any block changes...but the rats nest changed to a black box

I am not aware of any internal changes, only external ones such as vacuum/boost control and turbos.

not exactly what you looking,but may help:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/99-rats-nest-replacement-block-315993/

Hah! Remembered where I saw it -

http://robrobinette.com/sae_article.htm

Dale

I see nothing indicating internal changes therefore I am going to assume that none were made. I appreciate your help

That article states the internals are the same, save the oil metering nozzles, which are close to being inside the engine :). That's an SAE article, so it's VERY accurate.

Dale

That's good enough for me

thanks