Suggestions for the Best Comp Ratio, Pistons & Cam for Street 340

Franko said
Thanks for all the excellent suggestions. I also talked with Mancini and Laysons.

Taking all comments into account, I am leaning toward the original Mopar Performance stock cam P4452782- AD- 268/276 and Lift- 429/444, RPM Range- Idle to 5,800. This may be a better fit with the fact that I will keep the iron intake, iron heads, stock exhaust and the original AVS, and not installing aftermarket aluminum equipment.
Also I lost sight of the fact that I may try to run in Pure Stock Drags just to see what a mostly original 340 will turn (although you can have a slightly larger cam).
It also appears that this cam was stock on lower compression 72 and 73 340s.
The guy at Mancinis also suggested that P4452761- AD- 268/272 and Lift- 450/455, RPM Range- 1,500 5,800 could work well with the reduced compression. How would driveablilty and torque be affected by the difference between the difference in the lower RPM Range rating between the 2 cams i.e. Idle vs 1,500?

Thanks again for your input.

I've run all three of the MP cams in the stock 340 range, I liked the original 340 cam the best, it had better pull. I wanted to step up when I was running the 268/272 .450"/.455" cam.

I also recommend using Rhoades lifters part # 2018. They bleed down at idle and take out about .025" lift and 15° duration and give you the full lift and duration of your cam by 3500 rpm. It's like having an adjustable cam for the low end and without sacrificing top end.

With a 318 with 9.2 compression, a stock 340 cam, rhoades lifters, 4 bbl and dual exhaust with a 2.76 gear, I got 17.75 mpg highway in my 68 Barracuda.

The 340 cam will give you nice power and some fuel economy if run with rhoades lifters.

Read the second article here for more info on rhoades lifters:

http://www.rhoadslifters.com/Pages/Articles.html

You can buy them here:

http://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=rhoades 2018