914-4 front control arms VS 911 Options

[-JR-]

I haven't had the opportunity to dismantle my front end... yet. I was under the impression that...

1. The torsion bar spline fits the leading edge of the control arm
2. The 914 torsion bar spline is smaller diameter than the 911 one

So the 911 arm is not identical to the 914. I see in PET that the part number for the 914-6 control arms match the 911.

I'm posting it because a reliable 914 source locally has told me that they are interchangable (911 / 914-4) but I didn't believe so.

Thanks to anyone who can clear this up.

[ClayPerrine]

The only difference between a 914/4 control arm and a 911 control arm are the splines for the torsion bars. The 914/6 uses the 911 control arm, so it has the 911 torsion bars.

Other than that one item, they are interchangeable. I have 914/4 control arms on my car with 911 struts and a 911 aluminum cross member. No problems getting anything to fit.

[-JR-]

The only difference between a 914/4 control arm and a 911 control arm are the splines for the torsion bars. The 914/6 uses the 911 control arm, so it has the 911 torsion bars.

Not sure if this is splitting hairs, but the 914-6 tortion bar isn't the same as the 911. Yes it has the same size splines, but it has a lower torsion strength to acount for the lower 914-6 weight.

Thanks everyone. for ringing in to.

Looks like my local 914 guru's got it wrong.

One last variant, I'm not sure any of us would see it, but apparently some 914-6 GT cars had torsion bars with different diameter splines at either end of the torsion bar. Not sure what the point was, maybe it was to save weight.