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a lot of people have used them... supposed to be pretty good. my brother has used them on a couple trucks, they fit with no problems. One of the 460's I got happened to come with some solid mounts or I'd have used the L&L's.
One thing I don't understand is what you mean when you say normal mounts. the L&L are usually used to convert one style stand to another motor, so there is no normal mount that would work.
Oh. well if you can swap to the correct stands for less I'd do that. Most people use L&L mounts because stock stands and mounts for the motor they want are hard to find or unavailable, and probably a lot of people use them because its 3 bolts on each side and the motor is in, versus cab stands on a 1/2 ton like mine meaning you have to unbolt the shock towers and all that, and those bolts are usually rusty to boot.
I've been running L&L's since I did my 460 swap 13 yrs ago without problem. I have seen where some members have had problems so today I called and quizzed them about quality.
The response was that they have been using the same Vulcanizing process for years and have never had "batch issues". They come with a lifetime warranty (original purchaser) and if anyone has had a problem to contact them. L&L Products
Yeah all their stuff has lifetime warranties, as far as I know. They are the only ones that sell headers with a lifetime warranty. I always considered them one of the "cadillac" brands...
I went with the "Extreme Duty 460 Conversion mounts" from JBG - they're freaking awesome and BULLETPROOF. Even if the bushing gets destroyed/chewed up, the bolt is captive and can't let the engine flop around more than about 3/4" in either direction.
They were a little more expensive than the L&L product, but I think they'll be worth it for the long haul!