smoking L20

[whitechef]

My 71 521 with an L20B was sitting for 3 years when I bought it due to an overheated and warped head. I had the head machined to flat and did nothing else. I put it back together and now it runs like a top, no coolant loss, lots of power, starts right up on frosty mornings, good oil pressure and doesn't get hot. The problem is it smokes like a freight train. I'm thinking maybe valve seals. When I had the head off the cylinders looked good with barely any ridge. I also asked the previous owner if it had smoked before she parked it and she said no. So waddafug? Any ideas? thanks guys.

[philip1]

did you rebuild the head? if not it should be done

[datsunaholic]

Sitting for 3 years after blowing a head gasket? I'd think the cylinders would be a tad rusty where the rings were sitting after all that time.

 

It COULD be the stem seals, though I've found that is seldom the case.

[]2eDeYe]

Yep, my smokey L's were broken and/or stuck rings.

[hang_510]

if it only smoke on start ups (& till warmed) then the valve seals would be the main suspect. since it does it all the time = rings. :(

 

i have the same escape smoke screen too :poop:

sat for 10 years though...

[philip1]

also if you are seeing oil in the water you probably need a new head they will crack an oil passage if they warp bad enough.