:having a problem with a motor build not to get into along story when I get the motor and put it in the car and fire it up for the first 30min shut it off change the oil adjust the valves to the correct spec fire it back up it is spitting gasssss out the s.u. like a water gun every thing I know tells me the the head was not done right i.e. valve seats and so on and so on of course builder says thats not it its your carbs the carbs came off motor i sold in dec worked perfect set on shelf tell put on new motor any thoughts

my carbs would spit from my fuel mixture being too lean.

... your carbs spitting? Overflows or ???