Motor mount material
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Motor mount material
It's been a while since I was active, not sure where everyone here is on their opinions and experiences with different motor mounts.
What's the better material these days? What's the best go-to for a hot street car with a pro-touring vibe?
stock rubber?
Poly (tends to raise engine)
Solid (harsh)
something else???
What's the better material these days? What's the best go-to for a hot street car with a pro-touring vibe?
stock rubber?
Poly (tends to raise engine)
Solid (harsh)
something else???
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T.L. (08-28-2023)
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: Motor mount material
I am running solid mounts and it is nowhere near as brutal as I thought it would be. Can't really tell the difference to be honest with you.
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Car: '87 TA
Engine: 6.0LS
Transmission: 4L80e, 3000 stall
Axle/Gears: 9 Bolt 3.27, posi,
Re: Motor mount material
I run factory rubber mounts and a poly trans mount. Cant tell the difference. Im sure if you had a stock engine it would be noticeable but for those us us with cammed engines with lumpy idles it will have vibrations regardless.
#5
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Re: Motor mount material
Running poly with a XE274 cam and a 350. There is some vibration but it is not bad. If you have a very low idle for that lumpy sound it may be worse.
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: Motor mount material
I had poly on the car since 07 or so, only complaint was that it raised the engine which, for me, caused a couple small problems.
I appreciate the feedback, I'm probably going to just use rubber and see how it holds up.
I appreciate the feedback, I'm probably going to just use rubber and see how it holds up.
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Car: 1987 IROC-Z
Engine: 406 on N20 w/ EFI
Transmission: P.B. 700R4
Axle/Gears: 12 bolt w/ 3.91
Re: Motor mount material
I run the polyurethane ones from energy suspension on the engine mounts
on the transmission, I have a rubber one.
this has worked well for 4 years of hard use
on the transmission, I have a rubber one.
this has worked well for 4 years of hard use
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Motor mount material
I have had Poly on my G20 and my Express van for more than 10 years. Holding up well. The poly mounts put the engine where it was designed to be and keep it there, had to install them on the Express van to get the Doug Thorley headers to fit as the old ones had sagged. When you replace the worn, sloppy, loose rubber mounts with poly, your throttle response will feel a lot better. The motor no longer moves around under the hood when you step on the throttle. I will never put rubber anywhere in the engine/trans mounting or suspension again.
Last edited by Fast355; 09-03-2023 at 08:26 PM.
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RedLeader289 (09-04-2023)
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