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68 charger 440 all stock (10.1 CR) I put in a comp XE268 cam and have been having rough idle and low vacuum issues. Degreed the cam in and all was as it should be.

I had previously been running 10deg spark advance which resulted in about 9-10" of vacuum at 850rpm. I recently set the timing by vacuum gage and seeing where it had the most vacuum. This brought my vacuum up to 14", but i have to advance the timing to 35-40deg initial at 850rpm to get this much vacuum...???? This seems way too high. I thought maybe the balancer had slipped so i checked top dead on #1 and timing mark is right at 0 where it should be.

Anyone have any ideas what might be the problem??



Here is my two cents on this... I had this same came in my 66 440 and I really did not like it.. It has a rough idle and I believe on the Comp Cams spec sheet it says the cam is a rough idle cam. I chased down everything, leaks, timing, etc. etc.. (much like your doing) to smooth it out. It has a rough idle and that is just the way it is.. IMO I would swap it out for a lunati voodoo series or a Crane..

RS23L7 4-Speed