Hi, I have a recently rebuilt, by me 4k miles ago, 351W in a 1989 SD EFI F250. I installed the mentioned Comp Cam camshaft and am wondering what idle vacuum I should expect. I also have no air pump or plumbing, short tube headers, no cats, true dual exhaust and a KN FIPK on this truck. The idle vacuum is wavering slightly at 15-16 in. hg., is that usual for this cam?
Thanks

 

what does the spec sheet from comp say? have you pulled codes to see if something else might be having a problem?

 

The cam card has no idle information, rpm range, or anything like that-just lifts, duration and open/close specs. I degreed the cam and it is installed as the card called for. There are no codes as of about a week ago and the MIL is not on.

 

why did you degree the cam. it should have been installed strait up. you can still have codes even though the CEL isnt on.

 

I degreed the cam to be sure the cam was ground correctly and I did install it straight up. It is at 0 degrees advanced and 0 degrees retarded..in other words, straight up. There must be someone else who is using or has used this cam that knows what their vacuum is/was... please?