Hi
My engine rebuild is near the end and i thought about AFR readings.
I would like to read AFR on the run and thought about bringing bungs into my Stainless Marine manifolds. Heard about sticking injectors and engines going lean and burn Pistons..., thought it would be a good idea. A frieend of mine has machined these spacers for me.
I would have to leave them in all the time because i have to cut the transom for the thru hulls on the right height. If I would leave the O2 Sensors in or not, I don't know yet, but the spacers would have to stay. These are not water cooled.

Some suggestions? Any Problems that i didn't think about?

Data:
502 Mag MPI (near stock)
thru Hulls
Stainless marine Manifolds
Silent Choice




Thanks!
Philipp

They look great, but I don't believe it is far enough down the pipe. You might be too close the exhaust ports. My suggestion is to put them in the pipe.