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Great work Dmerc. I've always had a feeling Tquads had potential. That cam is probably helping too. Does it run clean under 2000rpm?

Can't wait to see your before and after vacuum advance numbers too.

Is your comp ratio 10.5 or 8.5 to 1.

I've cracked 20 also. My 87 Ram, reg cab, shortbox has a 5.9 Magnum, 670 Holley, M1 dual plane, short headers. Then a 5 spd manual w 0.73 od and 3.55 gear and a 28" tire. Straight highway at just under 70 mph has returned 23 mpg. I'm pretty sure aero dynamics is my biggest roadblock in the quest for mileage.

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What is the advantage of running a 700R4 as opposed to a Chrysler OD transmission that wouldn't require an adapter?

I'm guessing it won't fit in the tunnel without modifications?

Just curious. Thanks.

PS - great job on the gas mileage!

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You'll really like the overdrive if you can get it in there. Your original gas mileage post is what inspired me to build a car that would get great gas mileage and still have some hit.

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Thanks, I don't know what to expect for miledge with it with the new 414 stroker, I am hopeing for mid 20s in ideal conditions. The big thing about if I put the OD in it is it will actually be displaceing less air at cruise then the 318 so mabey high 20s with the OD.

The formula I use is .69 (OD Ratio) X 414 = 286 inches per driveshaft revalution. The old motor was 323 inches per dirveshaft revalution. Friction should be lower and less air will be pumped so it should do less work inside it self. On the down side I will have more overlap witch I think is a big no-no in a mpg build.