Got the itch . .. .

1212 Views 9 Replies 7 Participants Last post by MEJ1990TM, Feb 10, 2011

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Discussion Starter · Feb 9, 2011

Took a huge road trip this last summer (1200 miles round trip) in the El Camino. Was really stoked to see what kind of mileage I could pull down. I was let down when I averaged just a hair below 13 MPG. It's getting me thinking that I should just forget it and put the 4.10s back in for the fun factor and say forget the mileage. However, $3.20-$3.40 gas in my area has me holding back. Back with the 4.10s the first round, I had a little 600 carb. Since then and putting the 2.73 in I switched to a 770 Holley, which I put a bigger squirter, pump cam and light secondary spring in. Now, it runs a lot better, but I'm afraid that going back to the 4.10s will get me like 5 MPG. I only put 2000 miles on it a year on average, but I think cutting my MPGs in half would severely discourage my driving it much. An OD trans. is out of the question, as we have a child on the way. I think I'm going to be lucky just to be able to hold on to the car. I wonder how long it would take an OD trans to pay for itself over straight 4.10s?

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427L88

· #7 · Feb 9, 2011

There is no point in comparing my milage to yours. Put the 600 back on, and tune it to work with the engine. First, ensure you have full timing, and I would also advise vaccum advance for crusing. Then tune the 600 to work. You should pick up 10% minimum.

If not, junk the trans and put a Richmond 5 speed in.

You'll gain another 10%, but you'll never make up the cost of the trans and kit.

Man, I need to do that wideband test Aaron. I'm stuck at 15+ with the hotter cam.

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