Quote:
Originally Posted by carbking
Bottom line is whether one blocks the crossover or leaves it open is entirely up to the individual.
Personal opinion is that FOR STREET ONLY DRIVEN VEHICLES, the only benefit is the paint won't burn off the crossover! Trailered race vehicles are a different story.
Cliff said it very well (over a couple of different posts) in that based on ones' tolerence of cold driveability issues and how rich one is willing to tune the carb, and when the vehicle is driven; one can get away with blocking the crossover.
The solution on my own GTO on which I blocked the crossover was a manual choke carburetor. Even in 75 degree weather, the engine likes some choke for up to 30 minutes driving around town. (Or, I can push the choke off, and restart the engine at each stop light!). Too much HP/CI on a street engine and tuning is responsible. I chose NOT to just throw too much fuel at the engine! On the highway, I get fuel economy most of you never even dream of  with no detonation on pump gasoline (93 octane).
And I would NEVER again block the crossover on my own street vehicle.
But the choice is left to each individual.
Jon. |
If you lived in Phoenix you might think differently. My one GTO is all stock with a qjet and open crossovers. When I shut the car off in the summer the fuel boils in the carb and stinks up the garage. Also it takes a while to start it the next time because the fuel had boiled away. My other GTO has the crossovers blocked and a Holley 4150. No stink and starts easy every time. It also has no choke. Takes slightly longer to warm up.