I know a few guys who have stick transmissions behind their stock 3800sc. They have used NEW stock mounts and they seem to hold OK but I favor poly mounts and dogbone as it is more solid. The downside is that there is more roughness and vibration felt when the engine is idling. I would definitely use poly or solid aluminum cradle mounts though.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
I know a few guys who have stick transmissions behind their stock 3800sc. They have used NEW stock mounts and they seem to hold OK but I favor poly mounts and dogbone as it is more solid. The downside is that there is more roughness and vibration felt when the engine is idling. I would definitely use poly or solid aluminum cradle mounts though.
Thank you. Mine is an auto so I think that will be easier on the mounts, yes?
I see the polys for $65-$90/ea and the rubber mounts for like $15-$20/ea. It's hard to ignore that price difference. Are the mounts difficult to change once the motor is in the car? If so then I just get the polys.
Thank you. Mine is an auto so I think that will be easier on the mounts, yes?
I see the polys for $65-$90/ea and the rubber mounts for like $15-$20/ea. It's hard to ignore that price difference. Are the mounts difficult to change once the motor is in the car? If so then I just get the polys.
Thanks again.
Stock NEW rubber trans mounts should work if you have a good dog bone to limit powertrain movement. The issue is that no one that I know of makes rubber trans and engine mounts for swaps. WCF charges about $375 for a complete set. I believe that Fierorog only makes front engine mount bracket. His tensioner bracket is also op notch and he may make a low alternator mount.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
Keep in mind the stock Fiero engine mounts were designed to handle the power output of a stock Fiero engine. You can expect life of the mounts to be reduced considerably, with a more powerful engine.
That said, I was able to break urethane motor mounts with a 3.4 V6. But that was 4000+ RPM clutch dumps, on a drag strip. So driving also plays a big role. So for example, if you're going to granny the car, then the rubber mounts should be fine. Just keep in mind, if you decide to get frisky there may be consequences.
In a roundabout way, I'm saying "rubber mounts for cruising, urethane for hard driving".
I found poly to be so annoying with noise harshness and vibration I switched everything back to rubber years ago and have not looked back.
I agree. That is the downside of using poly but I still use it as my Fiero is only used as a hobby car that goes to cruise nights and events. The longest trip that it sees is my home to Carlisle
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
