Well stock motor or modified motor the OEM motor mounts flex all to hell. This causes a "delay" in getting the torque to the driveline. Worse is the shock to the driveline when it does quit twisting and reaches its maximum flex and starts delivering the revs to the driveline. This is a major cause of "wheel hop" in our cars by the way..... We want instant torque. We shall have it.
So for many GTO owners (04-06) we have installed poly motor mounts. Some have also modified their trannie mount with windshield "poly glue" to stiffen the engine/trannie and stop all this flexing. Motor mounts are a PITA to replace IMHO but worse than that they will shake the enamel off your fucking teeth. Car shakes all to hell. Some worse than others but nevertheless it transfers the motor vibration to the chassis through the poly mounts.
Back in the day many of us chained our motors down. We literally bolted a chain to the drivers side head and then to the chassis. This stopped the engine from twisting towards the passengers side and gave us instant torque along with a giant woody. It worked. But the down side was it tried like hell to pull your drivers side head off the motor
And often times would loosen the head bolts on the drivers side head over time. Ricers in lil turbo/nitrous Honda's and Toyota's have been using Ingalls Stiffy's for some times to kill this torque flex. It bolts to the passenger side head and then to the chassis. This pushes against the motor versus pulling. I help quite a few kids in this area work on their cars and I can tell you the "Stiffy" works and doesn't have the downside of the chain method. Well Ingalls finally made a kit for the GTO. So I got one and installed it. Sum bitch. What a difference. Instant torque. No engine flex. Easy install. Quality and stout as a sum bitch.
First install the motor bracket. You guys with batteries up front will need to remove your battery. I have a rear mounted battery but do have the electrical connections and a vacuum reserve cannister where the battery used to be so that is the crap you are seeing I had to get all of that out of the way. I have a catch can and it poses no issues whatsoever fyi.
Pull of the passenger side wheel and drill 3 holes for the two brackets on the chassis. At first I thought this may be flimsy as the fender metal is thin as hell. But where they put it (the chassis bracket) it goes right in a seam and that is stout as hell. Also when you bolt the inner and outer brackets it is not ever going anywhere.
Here is the outer bracket. Man look at them new Monroe struts and Pedders springs will ya
Install the "shock absorber" between the two brackets. Clean it up. Re-install whatever you took out ...
Fire that bitch up and roll. I will tell you.....stock or modified this mod makes you grin. Instant torque. No vibration. Cheap and easy to do. I highly recommend it.
Here is the company....you may check on the 05 and 06 GTO's being different than the 04's. I didn't ask about 05/06 GTO's when I got this one for my 04. I know 05 and 6's are different over there on the passenger side fender well. I dunno....just be sure and check with them....
http://www.ingallseng.com/parts/ETD/stiffy.htm
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