JLmiller

Thanks for all the great advice, I have another question.

I just rebuild my 1970 convertible 350 to a 383. Should I upgrade my motor mounts?

resdoggie

If they are at all suspect, yes.

OzzyTom

I would put solid mounts in, especially if you have a manual trans.
It is the left mount that shears.
If putting in non solid mounts, certainly put the ones with the interlock to prevent excess engine torque lift when it breaks.

toobroketoretire

I have always used standard motor mounts but with a 3/8" bolt thru the middle of them with a self locking nut to hold the two halves together. That gives the dampening effect of a standard motor mount but prevents the engine from ever lifting up under hard acceleration. Or you can use "locking" motor mounts that have a mechanical stop built into them.

larrywalk

I had a left-side solid motor mount develop a 3/4 crack with about 6 months of usage. I'll never go that way again and am sticking to the newer rubber mounts with the safety interlocking feature.

fishslayer143

Use the heavy duty interlocking type mount.. unless you have a boatload of torque,and very sticky tires, you won t break them .