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I would remove the intake carefully, so as not to disturb the gaskets. Also, carefully inspect the gaskets once they're off for any witness marks indicating a compromised seal near the affected cylinder intake ports. You want to decisively find the issue while the motor is apart.
I generally like to glue the gasket to the head, around the intake port, using Gaskacinch. This adds a little insurance against gasket slippage when setting the intake onto the motor.
One more thing to remember, if your block and heads have been decked (or milled) your intake ports might not line up just right. I have had to get intake manifold cut so intake ports would line up. Also used thin metal gaskets to get runners to line up with intake ports on heads. This is something that should be checked regardless. Some performance shops use a scope and run it down intake manifold to check alignment. Intake gasket could interfere with air flow also.
I just thought of one other thing that would be very easy to check while you have it apart. You may want to check the threaded holes in the head that the intake bolts thread into. Maybe one of them is a little buggered up not allowing you to tighten the intake up properly. Or maybe check the length of the intake bolts. If they are too long, they may bottom out before the intake manifold is tight.
You can bet I'm gonna be checking all that and more this time around.
I think I'll end up doing this Monday or Tuesday. Right now my biggest concern is getting my carb cleaned out. I took it apart and it was just terrible inside. Rust and dirt everywhere! I'm going to have to spend a few more hours just cleaning the carb out before I can start reassembling it.
You can bet I'm gonna be checking all that and more this time around.
I think I'll end up doing this Monday or Tuesday. Right now my biggest concern is getting my carb cleaned out. I took it apart and it was just terrible inside. Rust and dirt everywhere! I'm going to have to spend a few more hours just cleaning the carb out before I can start reassembling it.
Time to invest and install a better fuel filtering system, then. I installed a 100 micron filter at the tank and a 40 micron filter near the carb. You don't want to have the same thing happening to a new carburetor.
Did that already when I got the truck. I got it pretty clean. What was left is getting filtered out. It's almost all clean now after probably 4 filters.
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