Big roller, dome piston, ported super victor….mid 600’s?? just not a big enough head to make 700, and it’s 200cc.
I found out how big it was putting a 1213 gasket up to them..lol
the Guy that has been 6.08 still has 1 5/8 headers on his car, and the motor is 11.6 to 1 with that 263@50 roller…who knows
he has been 1.30 60 foot thus far