ADA Head Domes....help!

[boccarp]

I just got a new ADA HEAD . It came with 37 domes. What dos that mean? My 2020 SJ has a Factory B pipe, MSD Ignition, lightened flywheel. No head or port work completely stock internals. Am I looking for trouble with these 37 domes? I see many people saying you need 28 or 33? What does that mean? Are the 37's just race gas or does the higher the number mean the less compression? I'm clueless here. Sorry in advance for being brain damaged.

 

[keith t]

37cc is quite large, I would say 35cc should be fine with good fuel ( approx 180psi cranking pressure,) 33cc you need good fuel and not hold throttle wide open (more freestyle) and should give around 200psi cranking

28cc is race gas territory

as with all these things there are so many variables that can affect these numbers, porting, altitude, fuel octane and so on

 

[boccarp]

ok so 37 is the most mild of the options. No race fuel just a little bump in comp. I dig it. Thank you for your info. I am slightly more intelligent now. Slightly...

 

[Racersedge]

I have ADA head with 35cc domes and my compression was at 192/194 and I run 2.5 gallons 110 sunoco race fuel and 2.5 gallons of 93 octane super unleaded. I have all same parts as you

 

[Big Kahuna]

37cc will give you around 170lbs compression if you have stock porting.