Almost done with the break in. Rich smoke from one side and a smal oil leak.

So, I recently installed my 350 mag longblock repower. I have about 9 and half hours on it and I have two problems.
1. The starbrd bank of the engine will smoke ( like rich fuel smoke) when I rev it up to about 1500 or more. Both banks gas when I am at 3000 or so more for a little while then it cleans up. What would cause this. I have a q jest carb and she idels great @ 675 no stumble. I would imagine it can't be the idle mix because it does run so rich until above idle circiut. Am I look at rejeting?

2. I have a small oil leak coming from the back of the intake manifold. I thought it was the sender ( turned out to be a loose conection) So the oil leaks only under load and it seems to be coming from the seal between the block and manifold. I used rv and did not use the little gaskets between these surfaces. Is this right ? Maybe my bead wasn't thick enough.


Other then that she runs and shifts awesome. Thanks for every ones help through the repower.

Re: Almost done with the break in. Rich smoke from one side and a smal oil leak.

after doing some research it would seem the smoke is steam ( is disapates quickly) and kinda makes sense because the side it comes from runs a little hotter on muffs.

Re: Almost done with the break in. Rich smoke from one side and a smal oil leak.

If when you put the manifold on you put the gaskets on then ran a bead of silicone on the block up the gasket. You almost got it right. I learned a long time ago to run the bead up the head then put the gaskets into the silicone and apply a little more on top of the gasket corner. If the gasket rides down the head a little and Bridges the gap between the head and block (as Most gaskets do) without silicone under the gasket it will seep oil especially when run hard. It is a simple fix to a real headache.


Also make sure you clean the block and manifold with brake clean on a rag so it is free of oil. Ant oil will cause the silicone to not stick to either part and that will seep oil as well.