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#1
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sub-frame bushings
Hello all,
This may seem like a dumb question but...I've been doing some refresh work on my 68 firebird. While underneath I noticed that the body/sub-frame bushing/mounts are all cracked and getting flattened out. If I were to replace them, are there things I should be worried about such as body panels coming out of alignment? One more question on this matter. Years ago I put in some hooker super-comp headers and they made contact with the floor. I had to apply some heat to them and bend them about a 1/4" to get the needed clearance. I'm now going with a new motor and a set of Doug's Headers. If I replace the body/sub-frame bushings, is there a chance that this would also improve the spacing between the floor and the headers? Again, sorry if this is a stupid question. It just seems to me that if I add fresh bushings there could be a whole series of unexpected that might happen. Thanks,
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#2
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Usually body panels do not move as long as fender bolts are all tight. To do the core support-at least on my second gens I loosen those bolts and the next ones back and put the jack under the core support to move it up enough to slide the old ones out and new ones in.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#3
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I am guessing you will get a little more body lift with new bushings, especially with poly, which won't have as much squish as rubber
Sent from my SM-G965U using Tapatalk
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
#4
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FWIW, I used the Moroso aluminum bushings decades ago in my second gen 73 T/A, Everything bolted up and never had to worry about the subframe shifting as the rubber compressed. I also had a 76 T/A with OEM bushings that was like a rubber band when you jacked it up.
If I was ever to own another subframe car it would have something besides the OEM bushings. |
The Following User Says Thank You to Sirrotica For This Useful Post: | ||
#5
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Great...thanks everyone. I'm going to jump in and do it. Figure with a new front suspension and shocks all around why not tighten up the body/frame while I'm at it.
Thanks!
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
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