I am sure the low compression hurts mileage.
Pistons being down the hole too far.
Anyone ever check the actual compression ratio on a stock 292?
How far down the bores were the pistons?
I never tested how rick or lean a factory carb is jetting by using a wide band O2 reader.
I got better mileage with a semi built 250 10:1 compression, 4bbl, headers, mild cam yada yada. 21 -25 MPG range 5 speed w/OD
Best my Moms 73 stock Nova 250 6 cyl & PG trans w/3:08 gears was 16-17 MPG
MBHD
