Smoke from Exhaust when driving at high speeds - Dead motor?

[Slightly Larger Roundies]

I also get blue/gray smoke on deceleration. Was talkingto Daron yesterday about this and he suggested valve seals and or rings. 

[1971Ginger]

I actually rebuilt my head, it helps with the smoke a lot but I still got a little at high rpms (3.5to 4k rpm) and that's probably the piston rings.

[TobyB]

find where youare down on fluid Collant, brake fluid or oil

 

 

Yeah, what are you losing?

 

A quart every 1000 miles of oil's considered normal,

anything else (water, brake fluid) isn't.

 

A really poorly adjusted (sunk float, for example) carb can do this too.

 

Smoke by itself's not an indicator of a failed longblock-

there are other things you need to rule out.

 

Hopefully, it's a brake master- of everything, that's easiest and cheapest to fix!

 

t

[michaelbend]

Contributing to this topic.  Same situation happened to me today.  White smoke only in higher RPMs...

I realized that after 55-60 mph white smoke appeared noticeably in the rearview mirror.  Smoke dissapeared when speed dropped or idle.

Checking later with my mechanic, he told me that everything in the engine bay seemed normal.  Then we found one broken grommet at the MC and BF reservoir almost empty.

It makes sense that brake fluid has entered the combustion chamber through the brake booster.

Tomorrow I will test the car again...

 

UPDATE. Car tested. Engine runs well. No more white smoke, but still some blue smoke over 80 MPH. Maybe new valve stem guides will help.

Edited February 9, 2020 by michaelbend
UPDATE