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Hey folks -
I'm getting ready for a pretty major project on my C5 - I'm assessing different engine mounts and would like some opinions.
This, like most cars here, will be a quick street build, seeing occasional auto-x or HPDE.
I have come to a few basic types of engine mounts:
OEM: Basically two studs with an oil filled bladder in the middle. Great for absorbing vibrations, not very durable or consistent over time.
The AFE Style thru-bolt mount
Two piece system with saddles and a thru-bolt, sorta like a sway bar link.
The AMT/Hinson design
A bushing captured between two "cups".
The LG Motorsports - true solid style
A hunk of metal with no bushing and a stud on each end.
I am wondering what folks like, and why? What are the benefits or drawbacks of each style?
To me the cup design seems the best option as it still provides some vibration isolation, without play. The AFE mount seems like over time the thru-bolt bushing will fail. The true solid style seems like a bad idea for anything that sees street use - also making a solid trans bushing a requirement to avoid loading up the transmission.
BUT - all of these assumptions are not based on any actual experience with C5's; just other cars and general engineering proto-knowledge.
Last edited by Lowend; Nov 28, 2025 at 11:26 AM.
Reason: trying to resize the images
No one seems to have strong opinions on this, so I went with my gut on this and ordered the AMT Vulcans. BF sale and seem like the more durable design.
No one seems to have strong opinions on this, so I went with my gut on this and ordered the AMT Vulcans. BF sale and seem like the more durable design.
As long as you can deal with the NVH they will probably last forever.
I have the Hinson #4051 units that are 3/8" shorter than stock. Then I used 0.531" ID x 3.0" OD x 1/16" thick SS fender washers from McMaster-Carr #91525A152 to get the exact position I wanted for my combination of parts with my engine and exhaust. I also wrapped the Hinson poly mounts in folded multi layered HD barbeque aluminum foil to protect them from the radiant heat coming off the ceramic coated LG Pro headers. I secured the foil with stainless steel ties (not shown in photos). The mount on the left is the old warn factory unit, one in the middle is new stock replacement mount, then the modified Hinson mount on the right.
No one seems to have strong opinions on this, so I went with my gut on this and ordered the AMT Vulcans. BF sale and seem like the more durable design.
Sorry I didn't see this earlier, but the AMT ones do transmit a signficant amount of vibration in the 2500 rpm to 4000 rpm range.
You will get more NVH so be prepared. Interior panel rattles, side mirror rattles. At least my old C5Z with a cam had those vibrations with AMT mounts (or any delrin/solid style mount). I ended up going back to stock since I did not feel any benefit worth putting up with the NVH.
Comparing Engine Mounts
