Are the brackets supplied that you weld to your subframe the holes on them you use those to mark holes on there SFC and then you can bolt your Subframe to the connectors right opposed to welding it solid?

At the chiropractors office they did an install on a 60 and welded it solid, so I guess the only way to get the subframe off is cut the welds later I would imagine 3 half inch grade 8 bolts on each side connecting the 2 frames wouldnt really allow muchflex at all not like the SFC that the bolt from the subframe to Floor goes through.

thoughts?

Are the brackets supplied that you weld to your subframe the holes on them you use those to mark holes on there SFC and then you can bolt your Subframe to the connectors right opposed to welding it solid?

At the chiropractors office they did an install on a 60 and welded it solid, so I guess the only way to get the subframe off is cut the welds later I would imagine 3 half inch grade 8 bolts on each side connecting the 2 frames wouldnt really allow muchflex at all not like the SFC that the bolt from the subframe to Floor goes through.

thoughts?

If you want to bolt the brackets to the subframe connectors, I would reinforce the SFC's by welding in a piece of DOM or similar tubing to keep the SFC from collapsing when you tighten the bolts. I did something similar and used 0.5" ID DOM tubing for 2 bolts on each side. I also replaced the DSE brackets with 2" wide, 0.25" thick brackets that were longer than the DSE brackets so I had a longer lever arm between the subframe and the SFC.

I would imagine 3 half inch grade 8 bolts on each side connecting the 2 frames wouldnt really allow muchflex at all not like the SFC that the bolt from the subframe to Floor goes through.

thoughts?

I'd think that the forces generated by a hard cornering car would flex em like a toothpick. Weld em solid.

Perhaps if you wanted to be able to take the sub off later, welding the sfc's to the sub and bolting them on in the back would still give you a very solid structure?
That seems like a good idea I just thought of...:D
Has anyone ever done it that way? It would give the car a 3/4 solid frame, bolted to the unibody in 8 places instead of just six...

Perhaps if you wanted to be able to take the sub off later, welding the sfc's to the sub and bolting them on in the back would still give you a very solid structure?

That seems like a good idea I just thought of...:D

Has anyone ever done it that way? It would give the car a 3/4 solid frame, bolted to the unibody in 8 places instead of just six...

JimM: For my current '68 build, I did what I think you're suggesting. I welded 2" x 0.25" "brackets" to the subframe overlapping the subframe 8-10" and extending about 10" behind the subframe. I drilled two holes in the extended brackets which match up with reinforced (as described above) holes in the SFC's. Each SFC gets two 1/2" grade 8 bolts that are about 8" apart. I'm certainly no mechanical engineer, but I expect that the connection will be pretty strong.

when it doubt Over engineer it... cant hurt eh>?

I have the DSE SFC on my 69 also.

Those holes you are referrin to are strictly for a rosette weld so as to strengthen the SFC's to the front subframe.

I had thought as you did, that I might use them for bolt holes, but they are actually not intended for that. I bit the bullet, sucked it up, and did not use bolts at either end. God forbid the car ever gets into an accident, but if it does I can always cut the SFC's out if I need to.

Oye Vaye!

I have a set of bolt on subframe connectors on my '02 SS, and autocross it regularly. I can't tell much of a difference between my car and a similar car with weld in SFC's.

In my opinion, they created these cars without the connectors from the factory, so whatever I do to stiffen it on top of that is icing on the cake. Sure, I may be giving up a little bit of rigidity, although I'm more than happy to make that compromise so that removal/maintenance is made much easier.

When it comes time to do SFC's on my '68 I'll be doing bolt in.

Well I like the DSE the part you weld to the floor cuz its clean Just not the bracket that dies te Front to the SFC solid. SO i like the idea of welding bracket to front and using 3 or so bolts through that to SFC with tubing inside so it doesnt bend it inwards Im sure 3 well torqued bolts on each side like that with DSE is way better then any bolt in kit and considering the flex of the bushing from subframe to body theres always conna be some flex dont think it would be noticeable.

Im sure the bolts could shear off but by the time that happens your engine is gonna be in your lap and your cars gonna be totateled so at that point who cares

Here is what I did on my latest build.
I like the fact that the sub can come out.
It is bolted on two sides and the SFC is reinforced with sleave so it won't crush when tightened.

http://i7.photobucket.com/albums/y299/screamindemon1/IMG_1795-1.jpg

Bingo!