I did'nt think it would be that much.Between a 351w and a 460 i could see that,but i do not know much about the 351m that I have.
Weight difference...351m vs 460
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More Turbo
Joined: Jan 2004
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From: Hawthorne,Ca.
Weight difference...351m vs 460
Hi and thanks for your help.I have a 79F150...thinking about the L&L 351m-460 swap.I was wondering about the weight difference.Do any of you folks know what they weight?
Tuned
Joined: May 2003
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From: Southern IL
Not for sure but I have a 78 that originally had a 351M/C-4. All I had to do was find the right engine mounts, right length driveshaft, and move the trans cross member back a couple of inches. Been running fine since 94 or 95. Drive shaft will depend on total length of Trans. Anyway, the weight difference has never been an issue, at least not on this old truck.
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More Turbo
Joined: Jan 2004
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From: Hawthorne,Ca.
I am installing a 6" lift in a week and was wondering if the front coils need to be different.On the Superlift brand lift on my 95F250(2wd) they had coils for super cab and reg cab soooooooooooo I was wondering IF there was a weight difference on the 351m vs 460 ? I'll be able to sleep better at night if you know what I mean.
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Weight Difference
I have a 1978 F150 2wd,, that came with the 351M. I lowered it and kept that stock coil springs. I had a 351C in it up until this summer and I just finsihed putting the 460 in. The front end heigth is still the same. I had the same question when I was lowering it and eveyone told me that the wieght difference was 180 to 200 lbs. The stock 351M weighs (I think) 550 lbs and the 460 weighs 720 to 730 lbs. That is with the stock ac pump and everything.
Tuned
Joined: May 2003
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From: Southern IL
I just don't think it's enough of a difference to even consider a problem. From a straight 6 to a 460, there might be enough to think about but I've changed from one size to another for over 20 years and never had a problem due to the weight difference.
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Hey RR, I'm doing swap plates for a '68-79 using 351/400M mounts & a 460 if you're interested...
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From: Billings Montana
Another trick you could try is if they have coils for a truck with A/C, it might give you a little extra lift in the front to hold up that 460.
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Tuned
Joined: May 2003
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From: Southern IL
What would the A/C have to do with the weight class of the truck? I'm just curious. What I've seen is a difference between like a half ton and a three quarter ton. Not picking, trying to learn and thanks in advance.
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The front springs for an AC-equipped vehicle are usually a little beefier than the non-AC ones, to accomodate the weight of the compressor, condensor, evap. core assbly, receiver/dryer, plumbing, big, hefty bracket assembly etc. which all together weighs a fair amount. You can shave a bit of weight off a 460 with an aluminum intake, headers, and de-spaghettification of the engine compartment, even with AC. Prolly ~100 lbs.
I won't mention aluminum heads...oops...i did...
I think the 351M weighs a little more than that...nearly 600 without AC. No way it weighs less than a smallblock Chevy, which is 550 avg. The Cleveland weighs 550, maybe, but the M has a taller deck and a longer rod---maybe 30 more pounds at least, not counting antifreeze in the water jacket? The 460 without AC is ~650 I think. Difference between the M and the 460 isn't all that much, around 100 lbs or so fully dressed...
I won't mention aluminum heads...oops...i did...
I think the 351M weighs a little more than that...nearly 600 without AC. No way it weighs less than a smallblock Chevy, which is 550 avg. The Cleveland weighs 550, maybe, but the M has a taller deck and a longer rod---maybe 30 more pounds at least, not counting antifreeze in the water jacket? The 460 without AC is ~650 I think. Difference between the M and the 460 isn't all that much, around 100 lbs or so fully dressed...
Tuned
Joined: May 2003
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From: Southern IL
So if you were to mount your spare tire to the front of your truck, you should change your coil springs? I can understand that it will help, perhaps, but, still not enough to make a significant difference. If 100 lbs. makes that much diff., they are too light and shouldn't be on the trucks to begin with.
Posting Guru
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From: Billings Montana
I totally agree, when my buddy and I did this to his 73 F-150, he wanted a winch and bumper etc. The old ones were worn out anyway, so he found spring from a 78 w/AC and presto chango, with a few #!%&*$$ later, he had the right stance. But I agree that if it's only 100lbs, just leave well enough alone.
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You can sit your kid, or wife/girlfriend (gosh, I hope so, anyway...) on the hood to get an idea of how she'll sit with the 460 in 'er-for as long as they're inclined to cooperate, that is. A true test of love? I can see it now: "Sweetie, can you jes' sit there lookin' pretty for a minute or two? Right in the middle there...here, lemme help ya, dear...up we go...hrmph!" "Aww, here you go again with that truck of yours, can we make it quick, please, honey, I gotta go get dinner started!"
I've done a few M to 460 swaps and never had to change the springs, unless they were sacked to begin with.
I've done a few M to 460 swaps and never had to change the springs, unless they were sacked to begin with.
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