Port my current M1 single plane or install the RPM Air Gap?

rumblefish360 said

I have never seen or remembered a spreadbore intake for the W2. The W5 is the only W head to have a spreadbore intake and it is almost exactly the same as the LA intake save the relocated bolt holes that are of course, moved out.

All the rest are a square bore.

Click to expand...

That's the same intake I have 4452893 it bolted to the RPM heads with enlargement of the bolt holes. The bolt holes in your intake do indeed look spaced wider. Did they use the same casting# and drill the holes spaced wider for the W5? If the ports and volume are the same on the W5 intake and this intake is the same as the W5 intake, I'm certain my combo isn't taxing the intake. I am fairly certain anyone running W5 heads are porting both the heads and the intake though.