Port my current M1 single plane or install the RPM Air Gap?

rumblefish360 said

Personally I’d run with Ratbastards suggestion.

Your exhaust is TTI W/an X pipe?
This throws away low end torque. A pressure wave cancellation box should have been tested after the header for increased low end torque output.

Questions!!!!

What size tires are you running?
What is your overdrive gear?
What are your cruise RPM’s?
What model carb? (Mechanical or vacuum?)

At 422 cubes, getting a tic over 20 MPG‘S is very very good.
The 2.196 final drive ratio with the cubes and cam size, WOW!

Click to expand...

Tires are 275/60/15 BFG drag T/A 28
OD gear is .68
1700 1800 RPM@ 70 72 MPH.
Model carb? It was a BG Street Demon mechanical 750 the secondary linkage is set progressive. The body is a Proform center and the BG center is in a box in the shop I'm not sure of part # or if it's legible still. I swapped everything over so I could get screw in air bleeds as the carb was on my 340 first and needed bleeds to get the idle circuit functioning correctly, the stroker needed the bigger bleeds back in. I talked with BG three times to get it dialed he made suggestions, and I just did everything he suggested and tested it. I was going to purchase an 850 from when #6 exhaust lobe and lifter lost elevation. I would probably remember better if he hadn't made it so easy. I drove with a vacuum gauge connected for weeks as well as my mighty vac connected to my vacuum advance tools and jet kit in the trunk. My timing curve is 18 initial 18 mechanical for 36 at I think 2000 2400rpm the vacuum is pulling up to 44 and is adjustable. If I was in 5th cruising 15 1600 it would have a slight surge that I believe was likely a vacuum advance / timing surge. Where I live and travel to has allot to do with MPG. I'm 72 miles to Fallon no stops and 15 miles of 55 to 60 mph zone, Reno is another 60 miles with maybe two stops back then. Vegas is a 300 miles south and one stop sign in Beatty. I did fuel average to and from Reno twice being responsible 5 over max each fill got me just over the 20 mpg, but it's difficult to drive so reserved. Most of my miles would be in the mid-teens not that I checked often when driving spirited.