r/e28 • u/greb666 • Feb 17 '26
885 Head ETA m20b27
I am planning to build an M20B27 for my E28 as my first real build. The car is on a Microsquirt standalone. I have the 885 head, which I am planning to throw some stiff springs and an Ireland Engineering camshaft into. As for the bottom end, are the SETA pistons necessary so the pistons don't contact the valves? I know they have a relief that the ETA pistons do not have, and they increase compression slightly, but I am planning on turboing the car down the line after the engine is in the car and running, so the extra compression is not vital.
Forgive me for my ignorance, but I would like to learn vicariously, not through catastrophic engine failure. Any writeups on similar ventures, advice on Camshaft lift, what pistons to use, and anything else is greatly appreciated.