Hi everyone. I posted here a while back about the smoking from my 66 mustang that had a fairly recent rebuild. Well, it would smoke on hard acceleration. Someone suggested to try a pcv valve for the year engine that was rebuilt and placed in the car. Original 289 was worn out so I had to use a '79/302 for the rebuild. Well, I had put the old 289 pcv on the '79/302...never would have thought it would make a difference. Well, awhile back I got a pcv for the 302 and today decided to try it out. Well, it worked and the smoke on hard acceleration is no more! :nono: Now maybe someone could 'splain to me why it would make a difference? The valve is smaller than the old one...just curious.