340 cam in a 318

toolmanmike said
Agree ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
There's always a lot of 318 cam threads when all of a sudden it has a 4 barrel and intake, headers, and some 340 or aluminum heads. Not the same as sliding a 340 cam into your stock 318-2 barrel with single exhaust. :lol::lol:

318willrun said
I'm pretty sure I'll do this... ^^ and I'm pretty sure the car will go faster than any factory stock 318 2bbl Duster. I firmly believe if you are going to install a 340 cam in a 318, a 4bbl and dual exhaust should by all means be part of the plan. But I'm confident that it would outperform the stock 318 cam if it was left as a 2bbl.

Dartswinger70 said
I had read somewhere that the stock LA 318 cam is pretty good in that application, you could just swap the intake and put a 4 barrel on it and it would run well.

of course I had gotten rid of my stock 318 cam long before I read that LOL!

Dual exhaust is the first thing that should be done to increase the performance of a stock 318... Before any cam and intake change...

I had a 70 Dart Swinger with a stock 318... While on the way to Chicago from Detroit, I got the car to 60 MPH and nailed it to see how long it would take to get to 100 MPH on the highway... It took over a quarter mile or so, it felt like forever, the speedometer climbed very slowly....

I later had a mandrel bent 2 1/4" dual exhaust with street turbo mufflers installed on the car and then took it on the highway and did the same thing... It went from 60 MPH to 100 MPH in much less than a quarter mile... The speedometer climbed much faster....

I didn't measure it scientifically by marking the distance and measuring with a stop watch, you can tell by the seat of your pants that the dual exhaust really woke the stock 318 up... Even with a stock 2 bbl...

The stock single exhaust on the 318 is very restrictive and is the bottle neck in performance....