Building Kent 1760 race engine?

[Mikeru1]

Greetings, busy with Kent race engine build and coming to the carb option of 42 or 45 DCOE?

[Graham]

if your going full race then 45

[katana]

When I saw 42 DCOE I though that must be a typo then found they were std on Triumph 6's and quite rare! Every day's a skool day!
Graham - wouldn't they perform similarly if used with similar choke sizes or would the choking down on the 45's result in better gas speed?

[Graham]

yes and no, if the engine is really good then the butterfly can still be a restriction to airflow even with big chokes, spee might be important, but ultimately poor speed just means bigger jets,
my mate used to have an 1600x/f used to give max power on 50mm sidedrafts, it could of come a long long way down on carb and choke size and given almost as much power, its like a lot of full race bmw m10s use 48's with 42mm chokes, they would probably only give 5bhp less on 45's and 38chokes, but if you looking for the max.........