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A camM cam? 2.5 or 3k I'd shoot for, but I rap mine up, need to swap to this A cam i got. THey say for best mileage swap to a T cam. I went from 28 to 25 swapping from T cam to A cam in my turbo car. Just don't lug it. I gotta go at least 60 for 5th with the 3.31 rear in my 88 wagon. I think I need a new center support bearing. I could lug more with more advanced race timing but then I gotta run premium. Now back to normal ignition timing and regular. LH 2.4 flat flywheel.
But 28mpg is easily attainable with a b-cam and 10:1cr with a m47, and that includes romping on it.The best MPG I ever got out of my b230/m47 sedan was 30.2mpg on 87oct with an M cam that never saw over 3k
I had the same experience with my 85I’ve always been able to get 28-30 if I kept the speeds reasonable on the freeway. A M-cam and stock compression b230 gets worse mileage above 65/70 in my experience.
Stock CR is well below the published numbers, and getting the CR up helps so much with efficiency. Bonus with the m-cam, it’ll keep you from reving it out all the time!
You can put LH2.4 in your car and have a shift light from Volvo. It usually comes on around 2.5k rpms. I gotta say even with an M cam that shift point had the engine lugging everywhere.