SR Block questions...

[JFoxx]

i did a search and couldnt find what i was looking for. i know most of the differences in the s13, 14, and 15 red and black tops. most all the differences are related to the head, manifold, sensors or whatever. is there and differences in the blocks of these motors? apart from the different thread pattern on the oil filter?

i have an s13 redtop, looking at picking up a second block for a stroker kit. another guy has a balcktop(i think s13) for sale, is it the same block?

[herbieS13]

yes
msglenght

[Seraphim38]

The S15 black top vvt engine requires a different oil filter adapter if you want to convert to an oil cooler setup. Red top and black top cylinder heads differ in only miniscule ways (visible ribs on the front of the casting on later black top heads).

Each ECU (red top, black top and black top vvt) are not interchangeable--they are specific and different for each motor.

Black top pistons I have heard are minimally different while compression remains unchanged. Black top castings have better oiling channels. Though, these changes are not substantial as it relates to performance.