SR20 Red top or black top??? SR gurus?

[VQZ33]

alright everyone I know for sure I have a s13 motor but I'm frustrated to not know wether it is a blacktop or redtop. It has a red top but has the cooling fins on the front of the motor, it says 52f on the head AND the block, i have the fat 02 sensor (pretty sure, i havent seen them side by side but if i remember right it looks about the size of my old 300zx 02 sensor), my injectors are purple... I guess to rephrase do i have the 54c internals like the blacktop also with the updated oil squirters? any advice/info would be great.... i dont feel like taking off the oil pan to look at the oil pickup... I can add pics for those who are curious...

[Sileighty_85]

Give me the Part number off the ECU and I can tell you the Year of your engine

Will be like
Ex. 23710 50F00

[Om1kron]

it's either a blacktop motor or the type-x redtop. I wouldn't beat yourself up over it.

[jacobs13]

I have one of these its a late model redtop, they have fins and such.I have both a redtop and a blacktop and they are almost identical

[Kingtal0n]

A] If you look straight down through the spark plug hole you can usually see the 54C stamped into the piston

B] The ecu doesnt ultimatelly matter because harnesses are interchangable,
however, J4/J5 =1997/1998 blacktop type-x (S13 180sx 1998 got these I think? )
62/63 = [1989-1992 redtop.
E5 = [1992/1995]-1996 blacktop S13

I dont remember the exact years but I am sure you this will point you in the right direction.

C] it really doesnt matter. you have an SR20, pay more attention to the condition of the parts instead of the nature of their creation, because its what you got in front of you at this very instant.

[AdrenalineS14]

REDTOP BLACKTOP its pretty much the same thing bro i wouldnt worry to much about it either... its only tiny differents between the 2