Which Carb Gives a Balance of Power & MPG?
The 71 carbs or C.S. carbs are the most forgiving if jetting is not spot on they will make good power on a stock 340 and also a 420+ stroker in stock form. 72 and later carbs have conventional jets ect.. and are better to tune due to the same jets used from 72 to the end of production. but if your going to use it on anything other than a mild motor your going to need a lathe to drill out jets and also the seats are small at .093 any kind of motor making over about 425hp should have the seats drilled out to about .100 to .105. no one makes aftermarket pri/sec jets and hi flow needle and seats.
The 71 carbs or C.S. carbs are the most forgiving if jetting is not spot on they will make good power on a stock 340 and also a 420+ stroker in stock form. 72 and later carbs have conventional jets ect.. and are better to tune due to the same jets used from 72 to the end of production. but if your going to use it on anything other than a mild motor your going to need a lathe to drill out jets and also the seats are small at .093 any kind of motor making over about 425hp should have the seats drilled out to about .100 to .105. no one makes aftermarket pri/sec jets and hi flow needle and seats.