what size domes for 4216 cub engine

[superfastyfz450driver]

hi guys what size domes do you guys recomenend for a 4mm stroker 421 cub engine running on alcohol ,for clay oval track racing thanks

 

jonathan jans also anybody here have any rough estimates on horsepower output

[No Limit Powersports]

Whats your elevation. Tell us a little more about your other supporting mods. Alky likes to be around 15.5-16.5:1

[superfastyfz450driver]

mods are as follows mikuni tmx 36 mm flat slide carbs, hot rods 4mm stroker crank with 5mm long rods, supporting cheeta cub cylinder in 68mm bore, cpi inframes, elevation the bike will be running will be between 150 feet above sea level and 7-800 above

[krispy05shee]

As for alky i have no experiance with but im running 21cc domes cut 9 degrees burning vp 110, my compression is 160 with a .051 squish timing advance 5 degrees, my elev is around 1500ft. im sure you could go with 17-18cc with alcohol without any problem, but id run at least +7 or higher on your timing. thats what id try first anyway!