Comp Cam XE274H
I have a XE284 in my 318 and it idled pretty crappy...
1971 Dodge Dart Swinger 318 exhaust vid with hooke
But that was a low compression 318 so with a decent 340 I think a 274 will idle pretty smooth, small amount of lope, and have good vacuum. Every combo is going to be a bit different. And you should definately go with the springs that Comp cams recommends for that cam, so that the spring rate matches the lobe pattern.
I have a XE284 in my 318 and it idled pretty crappy...
1971 Dodge Dart Swinger 318 exhaust vid with hookeBut that was a low compression 318 so with a decent 340 I think a 274 will idle pretty smooth, small amount of lope, and have good vacuum. Every combo is going to be a bit different. And you should definately go with the springs that Comp cams recommends for that cam, so that the spring rate matches the lobe pattern.