six pack help

[MaD MaX]

Hi all

I have a '68 Charger with a 440 4brl. I have bought a six pack setup from Mopar to install and am wondering if I should change the cam at the same time. If so, which do I use. The engine is a '73 with 9.5:1 comp. pistons, factory headers, electronic ignition and a "1 up from stock cam" as I was told by the person I bought the car from. There are so many combinations! This is not a race car but a cruiser. It has to be street friendly (while also being loud and mean). Future plans to swap the auto 3 spd for a 4 sp. Don't know if that makes any difference..

Help Please!

 

[1969CoronetR/T]

Mopar Muscle magazine just did an article on changing your 4 barrel to a six pack. I think it was last months issue,

 

[Meep-Meep]

Without knowing what you got makes it hard to plan around. You can check the vacuum at idle, check compression pressure and note if it has a rough idle. Normal vacuum readings around 15-18 in HG at idle indicates a stock type cam. Compression pressure in the 150 - 160 range with a mild cam may very well be around 9.0:1 CR. A six pack with a factory style intake should work fine in this environment. You of course could optimize your engine by selecting a cam of some known quantity and verifying the actual CR.

 

[wagonmaster]

I did this back in 1969 with a 440/375 and it ran well. Ball bearing progressive-type linkage was key in making me happy with the response, but I had a 4 speed car with headers and a 4.10 Dana. Not needed so much with an automatic. Your '73 motor will be fine with it as is if you wish.
Good luck!