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Post by spud on Jan 28, 2021 11:39:34 GMT -8
More crack sacks. Quit that. Heres a sound question regarding mileage. Since my 304 gets 16 mpg mostly, sometimes 15 sometimes 17 , what do you think a 360 will do? Or a 401? I dont think they would be drastically worse? Unless i get happy feet and stomp the gas. Seems kinda like it takes a given amount of energy to cruise at hiway speeds, and a 304 would work a little harder but still make the power required, a 360 would not have to work as hard but would need turned slower to keep from eating as much air & fuel... any thoughts on that? Would either one do similar with the same drivetrain and cruise rpm? Is overdrive the key to better milage with either?
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Post by landbarge on Jan 28, 2021 11:48:18 GMT -8
Free 390's? Are they all "windowed" so you don't have to pull the pan to get the remaining rods out?
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Post by Captain Awesome on Jan 28, 2021 11:56:00 GMT -8
I'm surprised a bunch of Goobers aren't all over those blocks, with grand dreams of sleeving them.
I guess their Mom's don't allow them to travel far from the House.
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Post by Captain Awesome on Jan 28, 2021 11:56:58 GMT -8
360 got great mid teen mpg in my dad's 78 Cherokee. Had the Motocrap 2bbl with 2 stage PV and 3.07 gear.
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acm
Cool Froods
Posts: 308
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Post by acm on Jan 28, 2021 12:41:13 GMT -8
Have a mid 80's 360 stuck in a 71 2 dr Matador and it gets 14-15 mpg driving "moderately". Motor is nothing special, basic rebuild 15 years ago with performer cam, intake and small Holley. No clue what gears are in the back but I'd be surprised if they were any deeper than 3.15's (most likely 2ish). Have less than a grand into the motor and probably the mostest fun car I have on the road right now, but I tend to throw 360's in almost everything. There cheap, plentiful and just work.
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Post by PHAT69AMX on Jan 28, 2021 17:42:18 GMT -8
I'll go along with it takes the same amount of power to cruise a given weight at a given speed irregarless of engine size.
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Post by javtwotone on Jan 29, 2021 5:05:39 GMT -8
The three OD swaps I have done, all used a 3:54 rear gear. Two T-5 and one Tremec TKO. I remember the T-5's first gear kinda being too low, while the TKO felt spot on. All cruised 75 MPH easily. The 360 with the old-ass Holley Projection and T-5 got 20 MPG straight highway cruising and no screwing around. The 401 with an 800 Holley, lumpy cam and TKO, got 15 MPG straight highway with maybe a couple of WOT moments..
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Post by spud on Jan 29, 2021 8:33:15 GMT -8
I'll go along with it takes the same amount of power to cruise a given weight at a given speed irregarless of engine size. It seems plausible. The twist is a bigger engine eats more air and fuel on every revolution( well at a given throttle opening, which is the control) so if a overdrive was employed the bigger engine would naturally have more torque at a lower rpm and would need turned slower to really optimize milage, or milage loss...
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Post by landbarge on Jan 29, 2021 8:40:11 GMT -8
Weight isnt the only issue. Aero drag on tire width and front area, maintaining toe is also big.
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Post by spud on Jan 29, 2021 8:40:53 GMT -8
The three OD swaps I have done, all used a 3:54 rear gear. Two T-5 and one Tremec TKO. I remember the T-5's first gear kinda being too low, while the TKO felt spot on. All cruised 75 MPH easily. The 360 with the old-ass Holley Projection and T-5 got 20 MPG straight highway cruising and no screwing around. The 401 with an 800 Holley, lumpy cam and TKO, got 15 MPG straight highway with maybe a couple of WOT moments.. Yeah gotta watch it , non “ WC” t-5s have a 3.27 low, that with a 3.54 is super low. I think the strong wc t-5s are 2.95 low. There are also cobra r t-5’s ( the proto TKO archeotypes) that have the 2.95 low. They are “ close ratio “ t-5s. Many different t-5s out there. Strongest is still a wimpy 300 ft lb rating. There are stronger t-5 versions out there from g force and others. Current evolution has eclipsed all those early and earlier t-5 designs...as tko evolved and is now being eclipsed by the new TKX. The tkx is a true high performance 5 speed and has greatly improved shifting. It is curious how the t-5 has evolved and obsolescence is very rapid. Some versions of it scarcly got to market before they were outdone by the next design. Notably the mcleod trans, which was scarcely here before it disappeared, the new tkx is cheaper and better than older tko’s and such.
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Post by landbarge on Jan 29, 2021 9:29:39 GMT -8
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Post by spud on Jan 29, 2021 10:01:39 GMT -8
The 2.95 low is the highest torque rated at 300. Just enough to live in a stock 304.
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Post by landbarge on Jan 29, 2021 10:16:30 GMT -8
Mine has the granny 3.35 with the 3.54 rear. Well just have to see how it works since I'm not planning any tree launches.
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Post by spud on Jan 29, 2021 10:22:43 GMT -8
It wont bust as long as either you dont have traction and or dont slam full torque on it. I totalled out a t-5 in a 258 jeep trying to get it up a steep hill by hitting it too hard in first gear with a 258.
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Post by landbarge on Jan 29, 2021 11:51:46 GMT -8
Don't know what spec the jeeps used. This one is out of a later 80's mustang. 5.0. 265 pound torque. Only one without shipping 8 states away and not a left nut$$.
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