HELP
So I just picked up a 1986 Z-28 with a 305, 4bbl carb and a five speed. The motor has 100000 miles on it. It smokes bad all the time. Compression is good on all eight cyl. Whats the problem - Valve guides, rings, bad intake manifold gasket?
Should I just replace rebuild the motor.


spoiled brat

 

Title of topic says "My 96 Z smokes more than I do.. Help"

Would you like me to correct that to "86"?

 

Rings can be a problem on the 305, however your compression check would have indicated if they were bad. Valve guides are a possibility. Are you "losing" coolant or oil over time. Could just be a bad EGR valve. Lots of variables. Do you think the engine is warn out? Have you driven it "hard" over the years? One fairly easy check is to pull the valve covers and see if any of the oil return holes are clogged, or if it's nice and clean.
Repair or replace depends on your relationship with your mech. or shop. Replacing the short or long block is usually easier and faster.

 

Hi, thanks for the info, my 86, 305, has been sitting since 2002, changed out some hoses and basic stuff, wont pass smog, smokes pretty good at idle, pings at excel, i put some restore in the oil it seemed to lighting up but only ran it for 25 min. has 98,000 miles