Anyone use the solid motor mounts i have a 1970 442 and headers raddle against the brake proportion valve was thinking solid mount would stop it maybe

 

You need to relocate the proportioning valve to the top of the frame out of the way. I use a solid on the drivers side only.

 

My father; Oldsguy, fabricated solid motor mounts when he installed a 455 in his 46 66. There's a reason the OE motor mounts are impregnated with rubber. Do What Eric said and you'll be golden. It wouldn't be fun driving a car with solid motor mounts.

 

Yes. No need for a solid mount.
I’m still running stock mounts at 600+
They take a lot of vibration away.
-peter

 

What would you know about no fun with a solid motor mount? I have been running solid mount for 20 years no problems. Yes the car gets street miles as well as racing. At some point depending on how fast of a car a front plate resolves all issues. Oh Yeah I fabbed my mounts also.

 

I've heard that solid mounts alone stress the #2 main too much. A front plate alleviates that by spreading the twist out to the frame. I have a front plate with solid mounts as longitudinal limiters.
As far as "fun" goes, I'm having a blast; doesn't bother me at all.