Another fuel economy check with my '65 one ton

[TJ's Chevy]

Originally Posted by LuckyLightning

Thanks TJ, I subscribed to your channel as well. Here are some videos from driving today:

Driving this morning, cold outside.

Still driving but resting at a red light - RPMS are high again and the engine is louder/faster.

Arrived at destination, RPMs high and engine is louder/faster.

Driving this afternoon, all warmed up and doing better.

Sounds good. Old carbs and new carbs do that sometimes....the higher idle after driving. My 66's 292 will idle at 700 but after lots of driving it idles around 1000.....and that's with a brand new carb. I believe it to be vacuum. These engines didn't have to much vacuum.....and must be sealed up really good to prevent as many possible leaks as far as vacuum goes. Some aren't so bad...and others are worse. Nice vids.

[66Submarine]

Originally Posted by TJ's Chevy

These engines didn't have to much vacuum.....

What do you mean? I agree that vacuum leaks are a potential issue, as they are with anything else (although the intake/exhaust manifold design probably doesn't help things), but the sixes pull plenty of idle vacuum when they are running like they should be. It's not like they came with radical cams or anything.