I6 or v8
Fleet Mechanic
Joined: Aug 2016
Posts: 1,480
Likes: 6
From: Great White North
Gearing allows you to go highway speeds at a comfortable rpm. A big V8 will just get you to that speed faster and burn a lot more fuel doing it. A 302 V8 compared to a 300 big six is only 2ci difference but the 300 big six has a much longer stroke which makes it more efficient in the long run. A small V8 has a short stroke which allows it to rev faster thus getting more horsepower out of it at higher rpm. This is good for track racing such as the Trans Am series. A 390 could give you a lot of both but burns a lot of gas doing it. If you are just driving the truck empty as a pleasure and not towing or hauling the 240 will give you good mileage over your long distance.
Elder User
Joined: Jul 2004
Posts: 700
Likes: 0
From: Fairbanks
How about a gearing change. A 240 will do great with a 3.0 rear gear. I am running 3.55 with mine but I have an overdrive. I tried the 3.0 but the final drive with the overdrive was to steep. It worked great with out the overdrive engaged
Posting Guru
Joined: Jul 2015
Posts: 2,239
Likes: 5
From: Northeast Ohio USA
I'd trade my 302 C-6 for an I6 with a OD trans any day. At 65 mph, my truck is begging for another gear not to mention the high RPM's at that speed, and both fuel tanks better be full.
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Senior User
Joined: Jun 2015
Posts: 239
Likes: 3
Sorry I have not logged in in a while to see this question. I am not sure because the previous owner installed it, but I think it came from a mid 1970's F-250. I hope that helps.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
set out of a 65 Truck with a 352 in it and I am not sure what The one with the 3.0 came out of I bought it at a swap meet set up that way.9 inch: 1965/67 F100; 1968/77 F100 & 1975/77 F150 without L/S: AXLE code 08: 3.50-1.
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