What suggestions for stage 3 head for SPI mini? Basically how big should the valves be?
I have a maniflow lcb manifold with an RC40 exhaust system along with K&N in original box.
I am thinking of 1.3:1 rockers (MED) and large intake with variable fuel pressure valve from Japan.
Also would non original CAM help?
I will have to keep the original ECU also.
Then once power is done will fit the MED lighted clutch and flywheel.
So any suggestion's for the head would be great👍👍
Edited by R32Egor, 19 December 2025 - 11:49 AM.
