Engine Backfire ?

[boaterbob]

Just put a rebuilt in my 66. After about 30 miles it backFired out of the oil breather with alot of blue smoke coming in the cabin. All the gauges read okay. went on my way and about 10 miles later same thing. Again gauges okay and car runs fine. Could my Carb have an internal leak causing this explosion thus pressure in the crank case?
Thanks

 

[Dave ESPI]

any update on this ?

Perhaps you have a misfiring cylinder or a gasket that is leaking into the head hence causing blue smoke (oil)on a down stroke under certian acceleration condition ?