as per title really. will be on the rollers next week and at present running 36mm chokes. when would you be looking at stepping up to 38's or 40's. will be running at around 7500 rpm. engine spec rebuilt std 2e bootom end big valve ported and polished head 316 deg cam adj pully
I'd swap to 38mm chokes at around a true 170hp at the flywheel, 145-ish at the wheels. I have a customer 1800 8v hillclimb engine on 45's with 38mm chokes with 175hp @ 7,200 (tame-ish spec) and my own 1800 8v on 48's with 39mm chokes with 193hp @ 7,500-7,900. Neither lack any low end power or throttle response with the big chokes. If the the 2ltr is a good one (high comp to suit the cam & a good breathing head) it should be up around 180-190hp, so It'll need 38mm chokes.
