My first question as a new member

Now was it running normal before your drive or did it occur during?

Have you done a compression test? That would help with the diagnostic.

Dang, I gotta read more.

Darryl beat you by a wisker.

Thanks for the replys . I had a shop do a comp test said it was 125-130 . It is a No. match block but I do not know the history other than it has 68000miles .It only blows blue smoke after it is well warmed up. and a steddy popping with the air cleaner lid off when made to rev hard. Ithink this could mean a wore cam lobe? thanks for any and all your help

If compression holds even across all cylinders, I would suspect rings are bad on the blue smoke. On the popping,I would prolly guess the timing chain. To me, It doesn't sound to much like a cam problem.  But I'm not much of a cam person.

Thanks again for any and all help. Ok I just got my 72 in Jan. so I have not driven it much. It has no smoke upon start up . But after it is good and warm it pelts blue smoke out even out each exaust every time I rev it pops  out the carb  sounds like amachine gun.                                                                            Thanks

If it's a cam going down, you'll know it.  Not only will it pop, it won't have any strength and will dog down at all speeds and RPM's.

When my cam went, I thought it was the distributor, coil, tune-up, carb, and changed all, then it wouldn't even hardly pull itself out of it's parking spot so if the cam is going flat, you will find it gets significantly worse every time you try to drive it.

The bad cam years are well after your 72 BTW.  Later C3's had more cam issues.
dnv2007-05-03 08:08:42