170 psi 35cc domes

[Jameski]

I have a riva head with 35 cc domes and my compression was 170 psi. Id like to bump this up to 185psi, what cc domes would i need for this? ie how much would 1cc relate to in psi?

R/N super jet 701

 

[Sanford]

1) Compression gauges can vary and I've seen as much as 30psi discrepancy.

2) You will not notice a 15psi gain. I would leave it right where you are and chances are, your gauge is reading a little low.

3) Final (actual) compression depends on many combined factors. Dome size is half the picture.

4) You can have a 170psi motor detonate while a 190psi motor never detonate.