Car smoking...

[BlackVert]

Please explain what intake manifold vacuum would have to do with this? Valve stem seals are not subject to much if any intake manifold vacuum.

um, you are the one who suggested valve stem seals ...

yes there would be less vacuum in intake manifold at wot, but inside the combustion chamber it would be alot(like turning your vacuum cleaner from low to high speed). engine is nothing but a big air pump sucking air in pushing air out. when u go wot the pistons are pulling alot more air into the chambers. any oil film left on the valves would be pulled right off them into the chamber.

...

Yeah vert u are right but, they will also give you a burst of smoke at wot also. Think about that for a minute,you have oil trying to leak past a seal and down the valve stem. When you go wot and get a quick big suction in combustion chamber it will pull any oil hanging there on in the cylinder.

Now I know he didn't say he was smoking at start up but maybe he is in the beginning stages and it maybe not bad enough that he has noticed it yet?

compression test and leakage test would tell him for sure.

 

[chuck943]

yes I suggested valve stem seals because that is the common characteristics for leaking valve stem seals, puff of smoke at WOT and puff of smoke when starting vehicle after it has set awhile.
Not when intake manifold vacuum is at its highest.

 

[chuck943]

Worn valve stem oil seals (on new AFR heads???) would cause a puff of blue smoke from the exhaust when the vacuum in the intake manifold is high, and that's after you snap the throttle shut.

Sorry Bullitt!
After thinking on that one a little while I see what you are talking about. If intake valve stem seal was leaking then oil on the valve stem would get sucked into manifold when throttle was snapped shut. If they were leaking bad enough it probably would give you a good cloud of smoke on heavy decel.