Random question.. intake exhaust crossover with headers ?

Anybody ever experience a small block mopar plug the crossover and the engine run terrible. Then after removing the intake and cleaning out the passage it runs fine again?

just did that on a 360 this summer. I rebuilt the cab and checked out everything. Would run bad until it ran for 30 minutes and get heat in the intake. Then run fine. The crossover was plugged solid. Car ran like a top after that and the choke worked as normal.

I tried plugging a crossover on a stockish 440 I was drag racing. It would go 14.0 at 98 mph with 3.55 gears and 28” tall tires. After plugging crossover the car didn’t go any faster and drive ability was compromised, again it ran bad unless it ran long enough to get the intake hot. It was the only change made.

Wrapping it up, I’m not a fan of plugging the crossover on a stock engine.

If you have percolating fuel put on a wood spacer, keep the fuel line cool, or use non ethanol fuel, but seems to work for me when the floor of the intake is warm.

now a race engine with 11:1 compression and a big cam and carb it works fine. Those race intakes don’t even have a crossover made into them.