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Old 01-17-2004, 12:25 PM
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New rebuilt 350 smoking when changing gears?

I have a bone stock 350 Chevy w/Quardajet 4 brl that i overhauled that has me worried, i only have about 500 miles on it but when you accelarate and then let off of it it puts a big puff of smoke out of both sides.It has not used any oil yet,and i used cast iron rings on the pistons so they should have had time to seat .What could be causing this?Could it be the carb.?I know this is a hot rod site but you guys are the greatest!

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Old 01-17-2004, 12:30 PM
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Did you change the valve seals?

That would be my guess..OR the rings just havn't seated yet, but they should have.
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Old 01-17-2004, 01:12 PM
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Did you redo the heads? Sounds like loose intake guides or seals.
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Old 01-17-2004, 01:16 PM
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What color is the smoke ?
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Old 01-17-2004, 01:40 PM
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I had heads redone,the smoke is black or dark gray
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Old 01-17-2004, 01:43 PM
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shockers69,
It does sound like the intake guides are worn or the seals were not installed in the valve groove correctly. It is kind of hard to check them once the engine is together and running but it can be done. You will need a valve spring compressor for "in the car" use. Also you will need an air chuck to apply air pressure to the cylinder so the valve will not fall into the bore when you take the valve spring off of the valve. I like the "umbrella" valve seals myself. They ride on the valve and keep oil from being "sucked" down the stem of the valve on deceleration. But it does allow oil mist to lube the guide so they don't wear out. The seals that have to be forced onto the head will keep oil from going down the stem but it is so tight on the valve the guide never gets any lube so the guide wears even faster. Just my thoughts here people so don't get on me too hard.
After you install the after market seal install the spring and retainer but not the keepers yet. Before the keepers install the OEM valve seal in it's groove then install the keepers. Job done and ready to roll.
I would also check the drain back holes at the back of the engine. If oil can not get back to the lifter valley fast enough the extra oil will be sucked down the valve guides too.
Have Fun and lets us know how you fix the smoke problem.
Scholman
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Old 01-17-2004, 02:01 PM
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Black or grey smoke , I'd say it's unburnt fuel from where you've just gone from WOT to idle . Carb problem but I know diddly about Qjets , I'm sure somebody will be along shortly who does .
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Old 01-17-2004, 02:22 PM
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You might try a carb adjustment, that's all it took when my SBC had the puff @ WOT. It was running shall we say "A tad on the rich side." Just my $.02
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Old 01-17-2004, 03:03 PM
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If it is the carb and you have been running rich enough to puff smoke you better change your oil.


Tazz


Rat Rods Rule!
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Old 01-17-2004, 07:08 PM
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Grey/black is gas.

Blue is oil
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