360 punched 30 over
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i'm mainly wondering what it means in terms of gas mileage. it sounds like it each cylinder has been made larger, so it's basically like a larger cid engine. is that true? if so, what size engine would it be comparable to, just in terms of size. i tried to do the math, but couldn't come up with anything that seems to make sense.
Last edited by Unwound; Apr 5, 2005 at 09:46 PM.
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Post Fiend
Joined: Dec 2003
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From: "Islander"
With a bore increase of .030" over stock 4.050" you have 4.080". Bore squared x .7845 = piston area x 3.5" stroke X 8 = 366 cid. Besides a slight compression increase and a fresh motor you will not feel the displacement increase over stock.
Carl=o&o>....
Carl=o&o>....
Lead Driver
Joined: Apr 2001
Posts: 6,175
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From: Texas
Well, it's a .030 over FE motor. Take pi, multiply by 100, divide by all the cash in your wallet, send the money in your checking account to Shell and enjoy.
Mileage will be somewhere between bad and real bad.
The .030 over bore makes little difference in the mileage. The fact that its a 50 year old motor design, goes against getting decent mileage. Properly tuned with the right gears, a light foot, a tail wind, running on rocket fuel you might get 15mpg.
I love these FE motors.
Mileage will be somewhere between bad and real bad.
The .030 over bore makes little difference in the mileage. The fact that its a 50 year old motor design, goes against getting decent mileage. Properly tuned with the right gears, a light foot, a tail wind, running on rocket fuel you might get 15mpg.
I love these FE motors.
FE "Freakin Expensive"
Joined: Dec 2003
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From: Smith Mountain Lake, VA
Originally Posted by Unwound
hi--
i'm looking at a '71 F250 that came with a 360 (based on the VIN tag). the engine is advertised as "a 360 punched 30 over". what does this mean?
thanks.
i'm looking at a '71 F250 that came with a 360 (based on the VIN tag). the engine is advertised as "a 360 punched 30 over". what does this mean?
thanks.
And as Kurt said...treat it just like it was the 360, and as far as gas Mileage goes..it cant be any worse than the 390 (396) in my truck..10 miles to the gallon , Uphill,downhill, Camper on , Camper off...pulling a boat,not pulling a boat..driving with a Tornado behind me...10 milesto a gallon no matter what!!
Russ
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Thanks! I'll be satisfied with just bad mileage. I'm trying to avoid really bad, or really, really bad mileage. I've got a '78 F250 now with a 460 and it is killing me. I'm selling that and looking for a '69 - '72 cause that's the style I really want. But also, I'm hoping a smaller engine will help a bit on the mileage.
Does anyone think there is much difference in mileage-- all other things being equal-- between a 360 & a 390? How about a 390 & a 460? I've been hoping to find the truck I want with a 360, but I'm wondering if I should really be worrying if it has a 360 or a 390?
The one I'm looking at now claims to be getting 12+ since rebuilding the 650 Holly 4 barrel.
Does anyone think there is much difference in mileage-- all other things being equal-- between a 360 & a 390? How about a 390 & a 460? I've been hoping to find the truck I want with a 360, but I'm wondering if I should really be worrying if it has a 360 or a 390?
The one I'm looking at now claims to be getting 12+ since rebuilding the 650 Holly 4 barrel.
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Lead Driver
Joined: Apr 2001
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From: Texas
My 2 cents: Given a properly tuned engine, appropriate gearing and tires and similar driving style, the same weight and aerodynamics, you won't see much variation from in mileage from a 300 I6 up to a 460.
Find the truck that you like, tune the motor correctly, drive reasonably. 12-15 MPG is common for most every full size Ford I've owned (excluding the current FE446 project).
Find the truck that you like, tune the motor correctly, drive reasonably. 12-15 MPG is common for most every full size Ford I've owned (excluding the current FE446 project).
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Post Fiend
Joined: Sep 2004
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From: Near Fresno, California
I agree that when loaded and working the engine your milage will be about the same for all engines, but there is a big differance when you are empty and running down the highway.
My experance has been about 19 MPG with a six-4 speed, 21 MPG with 302-3 speed and overdrive, and 14 MPG with the 390-C6. I have never owned a 460, but when running with friends who do my 390 gets about 20% better mileage.
I don't think you will see any differance between a 360 and a 390 in normal driving.
My experance has been about 19 MPG with a six-4 speed, 21 MPG with 302-3 speed and overdrive, and 14 MPG with the 390-C6. I have never owned a 460, but when running with friends who do my 390 gets about 20% better mileage.
I don't think you will see any differance between a 360 and a 390 in normal driving.
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From: Fort Nelson B.C.
Most of the older 460's couldn't break 10mpg on the highway. My Dad a 76 1/2 ton 2wd and the best he got was 9. Go like stink though, pass everything but the gas station. My old boss had a 78 1/2 ton 2wd for a work truck. Man that thing was so bad on fuel I could watch the needle move. My 390 isn't tuned, runs like crap, needs everything replaced, has 4.10 gears, 4 spd and is 4x4....still get 11mpg on highway. A 360 should be better than a 460. Especially if you get it to breath, put headers on it.
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From: Texas
Originally Posted by gtex
Well, it's a .030 over FE motor. Take pi, multiply by 100, divide by all the cash in your wallet, send the money in your checking account to Shell and enjoy.
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