1973 duster 340 valve intake

does anybody know what size the valve intake is on a 1973 340 engine?
thanks

1.88, you can upgrade to a 2.02 or 2.05 if its going to be a 375+ hp engine

thanks for your reply and help.

Frank

hi, 340 makes 410 H.P. with 1.88 int valves, mopar stainless. the 1.88 has more port velocity , therefore, puts more air in cylinders = more power.
for the street, the 1.88 is more than enough!! on the qualifing sheet at gainesville, 340 ran 10.98, was a 72 or 73 duster stocker.

if you are an all out racer the larger intake will be happier at the big end.
if its a street car the smaller 1.88 will give you more bottom end and mid range.
the smaller valve will increase the velocity and give better throttle response too depending on your hp and gears.

It all depends on the head. My personal opinion has always been that the factory 340s with the 2.02 intake valves were over valved. The head ports in stock form really cannot take advantage of the larger valve in well over 90% of the driving a stock headed 340 will see. As said earlier, it is all about velocity. Getting it in and out. With the right camshaft profile matched to stock unported heads, I believe the 1.88 valve would indeed out perform the 2.02 in most instances in a mild to moderate street engine. It's one thing if you already have heads with the larger valves. But I certainly would not go to the trouble and expense of installing the larger valves unless I was building a larger cube or way more radical 340. All of this really is a guess. The real truth would have to be seen on a flow bench.