QUOTE Waveski "I do not understand how blocking that port could have a detrimental effect on idling. That heat seems useless to me - especially since I have manual choke. I’m sure that the manifold will warm up sufficiently without it; I doubt the heat reduction will be drastic." END QUOTE
It probably will, EVENTUALLY.
I personally built a very high performance 350, crossover is NOT blocked, rather the intake manifold I am using does not have the passage.
Results of cold start:
Drive around town, and with the carb I chose (electric choke) the engine would stall at EVERY stop sign or light for 30~45 minutes! Even when pushing in the clutch!
Baby it to the highway, and after 15 minutes at 70 MPH, then engine would idle normally.
In town, I used to be pretty good at heel / toe; but those days are now a figment of my memory. The solution was to change out the carb for one with a manual choke, and pull the choke about half way out at each stop for the first 45 minutes. Eventually, the engine will warm to the point where it will idle without choke.
When I built the engine some 25 years ago, the internet said block the cross-over; at WOT, the missing cross-over is good for about 1.5 percent increase in HP (so I went from about 450 to 457, yay!). By the time I finished the engine, I was too old to take it to the strip. With the manual choke, and pulling the choke at EVERY stop, the vehicle is as much fun to drive as I anticipated. I listened to the internet at the time. As posted earlier, one of the three dumbest mistakes I have made with cars in since 1959.
I guess my question in your case is why? I thought from earlier posts that you had decided to remove the imitation AFB and install a Q-Jet ?????
Jon
