I just installed Holley Sniper EFI, new aluminum intake, and headers on my 440 that has 750 miles on it. Engine fired right up, but when it gets to max temp 185-190, it starts blowing blue smoke from the exhaust. Any thoughts on what would cause this? There also appears to be oil dripping at the header collector flange. When I replaced the headers, I installed a fresh set of plugs and noticed that they had oil on them. I checked the PCV valve and it's good. I'm planning to do a compression check on all of the cylinders next but thought I'd check here the mean time.
If you have 750 miles on the engine and didn't have the smoking issue to that point and you have it now AFTER you installed a new (different) intake manifold I would agree with those members that say "intake" gasket or something related to the new intake manifold. Can't see how headers would create an oil burning issue being downstream of the combustion chambers. Overly rich condition could foul (wet) the spark plugs but the exhaust would either be black or whiteish smoke not blue like oil smoke. All of the valve stem seals couldn't have gone bad at the same time and that can be checked by running it up in the RPM and quickly backing off and your rear-view mirror will let you know if they are bad.
Did you just switch from a break-in oil to a full synthetic oil?
