Ok here is somethin i do last nighet when imsomnia attacks,
Went downstaresand start mocking up the engine tranny combo,
If you are familiar with Nissan u must know SR20 block castings are different from FWD to RWD
But u can use the FWD one in RWD with some modifications but you cant do the other way around!
You need to trim all that to get the RWD starter on its place,
Then in order to atach the tranny on that side a heavy duty bracket need to be fabricated, and that bracket is bolted to the side of the block and goes back to the tranny bellhousing under the starter, this bracket must be minimum 3/8 thick steel or 1/2 inch aluminum,
It will be cool and super strong, this way any SR20 block could be used and i dont have to be obligated to use the ABUSED RWD blocks only!
By the way those mods is only on the starter side cuz the other side it a prfect fit!
And Just in case you guys ask or worried about the amount of material to be removed from the block,,,
Is not that much for real, the RWD casting do not have the starter ring whatsoever and the only difference is the lower ear for bellhousing attachment is in a lower position, thats it, i am just replacing the lower ear with a fabricated bracket that bolts to the engine block next to the motor mount bracket and maybe 3 or 4 oil pan bolts all together,
I do drill one hole on the tranny bell to acomodate the top right hand bolt and use a spacer betwine the tranny bell and the engine cuz the bell is hollow there,
But here is a rugh sketch of what that bracket will look like!
By the way the top bracket is not necesary but i just trow it out there just in case someone ask!