Thread: Using highport valve train for a lowport RR 01 SE

I keep seeing where people is switching out the lowport valvetrain and swapping over to highport valvetrain because there is more cams available for the highports. Could this be a option? Im getting ready for my turbo build and have my motor on the engine stand and i was planning on getting some s3r's since there's not many options for the 00-01 sr's. I would like to have more options as for cams but i plan to leave the head stock thanks

I thought about this years ago but never went anywhere with it. I think you have to change the valves as well as the normal stuff you'd have to change anyway. The rollers take up a lot of room in the head so other things were adjusted if I can remember correctly. It's been a while. I think I remember reading that it can be done though.

Have you looked at other RR cam options such as Tomei, Piper and cat cams?

Yeah i sure have and jwt seems like the best as for the most duration of any cams out there but the others are cheaper and some are more expensive. I think im going to get a set of s3r's if i can put the highport valve train in my head but like you said you think you have to change valves ans stuff and i dont want to do that.

Found this on the old forum. I'm pretty sure I read this thread a couple years ago. Post 17 is the one you want for the details as described by JWT through a member. The whole thread has some good info as well.

Roller Rocker to non Roller Rocker - SR20 Forum



Edit: Found this as well -> Roller Rocker cam options - SR20 Forum

The S3R's with JWT springs can rev to 7600 safely if my memory serves me well. Which should be high enough for a small turbo I would think.

Are you going to run a 4 or 8 CWC?

wow thats exactly what i wanted to know thanks for that info and yes i will be running the stock 4 cw crank.

FYI, you don't have to go highport, you can also go lowport valvetrain (94-99). Roller Rockers are lowport too, but that's where the similarities end, thus we just call it Roller Rocker engine.

well I guess it makes sense what all would i have to do to switch it over to 94-99 lowport? Would it be worth my time and money to switch it for better cams if there are any better than the s3r's?

Eh I wouldn't bother with it unless your trying to make as much power as possible. Roller rocker arms are very efficient, I'm impressed how good a 5 speed fatty p11 feels with a roller rocker motor after you remove the header exhaust flow restriction (aka the cat).

Put a low port intake manifold and go to and 16 bit ecu and you should gain some decent power.

im guessing i would have to switch harnesses as well?

For the intake manifold and ecu yes. Reason intake manifold needs a new ECU, is because the RR throttle body wont bolt up to the DE intake manifold.