General Category > Quadrajet Carb Talk and Tips

Gm vortec crate motor carb?

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benbuff:
Will a carb work on a 99 gm 350 vortec crate engine?  I know they don't have a heat riser and wanted to know if I could use an edelbrockvortec qjet intake if I could run a qjet on it?

77cruiser:
How cold will it be driven in?

benbuff:
I live in Idaho so very cold.

77cruiser:
Probably not as cold as we are but you still need some carb heat below freezing. Some ducting from the exhaust manifold or headers like the factory used.

Cliff Ruggles:
All of the factory intakes for Q-jets used a heat cross-over from what I've seen.  This was done to get the intake heated up quickly and improve cold weather operation. 

You can still use a Q-jet on the Vortec engine even though it doesn't have any heat passages in the intake manifold.  It will be fine most of the year but expect some possible "icing" in really cold weather and it may not run well until the intake heat soaks some in the cold Winter months. 

It will be fine most of the time otherwise when outside temperatures are above freezing.  I haven't had a heat crossover on my engine for decades since I use aftermarket aluminum heads that don't use one.  I've never ran into any issues, and even started the car last Winter when it was 25 degrees below zero outside.  It did take a LONG time in that scenario before the intake heated up enough so the engine would idle, but fine after it heat soaked a bit.......Cliff

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