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So what kind of mileage are you guy's getting from a 289-302 4brl automatic? Trying to decide if I'm going to switch to a v8.
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Well, for gas mileage, I've got the worst cam, rearend ratio and driving habits you can have. But, when measured in smiles per miles, I have a lot of fun. As in all things in life, it's whatever floats your boat.
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16-17 with out OD
w/OD 20-19-+
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My 351W with a T5 overdrive trans and 3.70 rear gears got 24 MPG on a 1,000+ mile trip.
The overdrive tranny is key to making the car liveable on the highway. You CAN get good gas mileage if you set things up correctly.
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with my 65 302 ho with aod im getting 16. I m thinking I need to rejet that edelbrock 4 bbl, 3:00 rearend
Last edited by terry (8/11/2013 7:25 PM)
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16/17 on the highway. 5.0+030...World Product heads.... pretty serious roller....T-5(that's the key!) Edelbrock 600cfm and RPM intake... 3.00 gear(that helps mileage too)
6sally6
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My stock 289 in my 67 got 17/18 mpg. I added headers, dual exhaust, electronic ignition, an Edelbrock manifold and Holley 4 barrel. That dropped my milage to about 14. But it did run much, much better.
After some overheating problems I ended up with an aluminum radiator and a 192 thermostat. It runs at 190 all the time now and my milage went back to 17.
I'm running a C4 and 3.00 rear end.
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347 stroker w/ Holley 650 double pumper, C4 and 3.40 rear - mileage not to good at approx 12 mpg. I know that there are some tuning issues that would help improve that number and I will pursue those as soon as I can get around to it. Until then, it looks like it's a local show car only. Put a new 180 thermostat and it warms up faster so we'll see what that does for me.
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65 HT, stock 5.0, EFI, AOD, 3.55.....22 to 24 depending on terrain and cruising speed. Following Glen B across Wyoming at 85mph dropped it down a bit.
Last year Corky drove his FB and we had his 71(72?, 73?) Vert with carbed 5.0, AFR heads and a bit of cam...the vert got 20 and I think the FB with 331 and lots of cam did too. We were running 70-75 all the way from Ft. Walton Beach to Tomball.
BB
Last edited by Bullet Bob (8/12/2013 2:09 PM)
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