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  #16  
Old 03-13-2010, 11:34 AM
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Quote:
Originally Posted by jeffboubel View Post
Im positive you wont be happy with the results. It will be a turd at best. Thus meaning you will be smashing the loud pedal to the floor to try and get it to move at what that big block did at 1/4 throttle and will be burning the same amount if not more gas. Those windsors are neato in a 2500 lb car but you put em in a 5000lb truck and the torque just isnt there. i get 11.5 mpg in a 85 f-250 with a 460 thats doin 75 down the highway. look into your tuning and keep in mind its not a civic. You want gas milage put efi and an e40d on that 460. 15 mpg. The cost in any of these changes will take you forever to get back out of the effect.
You obviously have no experience with a bult 351w.
I have a built 460 in my truck and wouldn't have it any other way. It gets 6-9 mpg which is fine with me.
A built 351w will EASILY surprise a lot of 460s. In my opinion the 351w has a HUGE potential with all the 5.0 Mustang aftermarket out there.
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  #17  
Old 03-13-2010, 07:28 PM
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In a car... sure. In a 6000 or 7000 lb truck with 100+ lbs of tire in each wheel well, all else being equal, the 351 is never going to have anywhere even close to the torque of a 460. And if you are comparing a built 351w, from what Iv'e seen, 460's aren't any more expensive to start with, so compare it to a built 460. spend equal money on both. Its never gonna catch up.
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  #18  
Old 03-13-2010, 08:57 PM
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guys, i think youre missin the point. a well built 351W will run circles around a stock 460 and get better mileage. and from what the OP said, his primary concern is mileage. so i mildly built windsor to push him down the road at highway speed is what he is lookin for, not 1/4 skinny pedal that will light up the tires.
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  #19  
Old 03-13-2010, 09:29 PM
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I disagree. I think you could run higher gears with the 460 and use less loud pedal and get similar gas mileage to a built smaller motor that would need lower gears and more gas. You know when they finally put a v8 in the Hummer H3 it got better (by about half) gas mileage than the old I-5?
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  #20  
Old 03-13-2010, 09:52 PM
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ok. lets look at numbers. my 91 gets bout 8 to 10 mpg average. i might add that im NOT always hot roddin around. i cant afford the drop to 5 mpg. my classmate with a 300 I-6 and a right foot comparable in weight to an anvil gets 15. please explain this? also, yeah, a radical cam would need the rpms to run good. a solid RV cam can put that same power down low, so less revs are needed to run good.
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  #21  
Old 03-14-2010, 02:02 PM
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My six doesn't get near that. I'd have to know more to tell you one way or another. Are they the same truck?
curb weight, tire, alignment, gearing, lift, how many inches of vaccuum they are drawing... I mean there is a lot more to this than "my friend has one that gets better mpg than I do, so therefore that motor is better than mine."
My ag teacher in HS had nothing but 460's and he was getting over 12 mpg with a box built over the bed hauling produce home from pittsburgh twice a week for his grocery store.
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  #22  
Old 03-14-2010, 02:16 PM
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I have a 77 F250 4X4 C6 410 gears and I can get about 14 mpg with a stock 1969 460 in it with a 600 holley carb. I am light on the gas pedal but it will run circles around my short box F150 with a 400 in it.
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  #23  
Old 03-14-2010, 03:01 PM
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at this point, i really dont care what numbers people are gettin. i feel sorry for the OP cause weve gotten into a pissin match bout "well my 460 gets this and does this...yeah? well my 351 does this and gets way better..."

lets get back to the original topic and help a guy out with what he WANTS to know about.
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  #24  
Old 03-14-2010, 05:24 PM
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A buddy had a mild 351W w/ an AOD & swapped out to a 460/C6 w/ a 3.00 gear (460 torque pulls hard)....gets the same, if not better mileage w/ the 460 & non-od C6.
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  #25  
Old 03-14-2010, 05:32 PM
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I friend of mine went the swap route in his 79. Pulled the 460 and put in a 351 out of an 86. Did it to get better gas mileage.....wrong.
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  #26  
Old 03-14-2010, 08:23 PM
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The truck I'm building right now had a 302 in it with a C4. I don't know what kind of mileage it got but the power was always plenty and pulled our small camper when I was a kid. I'll either go back with the 302 or put a 351W in it. Why? Because I can and it's all I need. If I start pulling a lot of stuff I'll go get an F250 or use my '74 with a slightly beefed up 390.
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  #27  
Old 03-14-2010, 08:31 PM
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One of my 79's has a 302/C6 works just fine for me. I also have an 86 F250 SC with a 351 C-6 and comparing that with son's 89 F250 SC with a 460 C-6, no substitute for cubes. I've been using the 89 for hauling between NY and VA.
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  #28  
Old 02-03-2011, 03:04 PM
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I'm actually interested in getting some better gas mileage out of my 351, but I'm not sure where to start...
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  #29  
Old 02-03-2011, 04:06 PM
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what kinda mileage are you gettin now?
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  #30  
Old 02-03-2011, 04:10 PM
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Should we even be talking about MPG in these old trucks?? LOL Get what you like and run the hell out of it. No such thing as good in any of these trucks or engines. :-) Just my thought.......Old technology gets old fuel miles for the most part.
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Old 02-03-2011, 04:10 PM
 
 
 
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