I need different BBC 454 headers for my swap. Help?

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Injectedcutty

G body LS mafia
Nov 24, 2014
6,057
22,808
113
Louisville, KY
A couple of mine look that bad...I have been spraying them down for a couple days and will do so until the new bushings arrive...hopefully nothing breaks lol. So do all cars have the mounting point for the GN bushings even if they didn't come with them from the factory? Are they worth putting in if that is the case?
NOTE: don't use an impact to break the bolts loose! Just use a socket and ratchet and work them back and forth gently.

Yes, all of our cars have the spot for the GN bushings since the frame is the same. They are not fastened down with a bolt, they sit down into the hole...you will see once you look up there.
 
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TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,992
113
Socialist NY
The mounting point is there. No idea if its worth it hard to tell once you replace them all..
 
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Mhael

Apprentice
Jan 19, 2017
51
29
18
Well I got the new bushings installed, the bolt for the one behind the rear wheel on both sides was about as thick as a pencil and broke instantly...that was a fun couple nights getting those out lol. Ended up having to cut open the trunk floor on the passenger side and remove the cage nut to make a new one, the remnants of the bolt did not want to detach themselves from the nut even after drilling it out. Changing the bushings did give me some more clearance, I did have to push the floor up just a little though...but I did get the drivers side header completely installed, had to dent it a little bit to clearance the lower control arm mount. Passengers side is almost there, have to do some more work on the control arm mount. I do have a little issue on the rear most passenger side body bushing, when removing the original one I noticed that the bushing was sitting cocked and not sitting flat on the frame. The replacement poly bushing is sitting the same way, it is tight but not sitting completely flat against the frame. My bumper cover has always had a slight bulge on the side of it next to the quarter panel, so I don't know if the car got bumped at some point before I owned it and slight knocked it out of alignment or what. All the other bushings are sitting perfect... I was thinking of just getting a fender washer and cutting it half to shim the side that isn't bearing on the frame. Anyways, thanks for all the help and suggestions, I appreciate it.
 
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Chevyman540

Not-quite-so-new-guy
Jan 11, 2016
42
62
18
Which motor mounts are you using? I think there are few different heights of the clam shell style, but not positive.
I had clearance with the old body bushings and now have about an 1 1/4 inches to the header flange with new body bushings
 

Mhael

Apprentice
Jan 19, 2017
51
29
18
Which motor mounts are you using? I think there are few different heights of the clam shell style, but not positive.
I had clearance with the old body bushings and now have about an 1 1/4 inches to the header flange with new body bushings

I am using the motor side clam shells directly off the original 305 and I bought bought some OEM replacement rubber mounts for the frame side. I probably have about 3/4 of an inch of clearance between my drivers side flange and the floor pan...But I don't have the transmission installed right now, so that may change once I get that put in. So either I will loose some header clearance between the floor and gain some some clearance between the oil pan and the k member (which I need) or I'll gain header clearance and my oil pan will be slightly rubbing the k member in the corners.
 
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