Technical Front spring perch question

I am in the middle of sourcing all the parts to do an AV8 build and have a question regarding the front spring perch. I have a Model A frame, a 1936 axle and wishbone combo. I am thinking of keeping things somewhat original and would likely be using a set of Houdaille shocks, so I need the perch with the shock ball.

I was wondering if I should use a Model A spring perch or a later version? Is there a length difference in the various years of perches? I have a Model A one for mockup and the end of the threaded part just barely comes out the bottom (see pictures).

 

A factory nut is designed to fit up inside the hole/socket and may get enough nut to bit ?,but the wishbones do have a fatter top boss on newer year 36up then older one,so takes a longer pin same years as axle.

 

My little brother had the top of his late-model wishbones bored/beveled deeper. It lowers the car a little and gives you more room for the nut on the bottom.

 

I believe you will need to buy longer aftermarket spring perches and weld the shock mounts from your A perches onto them. There is not a factory perch long enough to do what you are trying to do.

 

Look at 32 34 perches. I think they are longer than the A perch.

 

I don't think they are longer since the '32 axle boss is 1/4" shorter than an A.

 

Shave and re taper the top of the wishbone. It's the only way to stay with stock parts (Model A perch pin).

I did my '35/'36 bones and a modified AA perch pin (no ball).





The AA pins modified.

 

That was what I was figuring I had to do to use the orignal Model A perches. How do taper the hole after grinding down the thick top perch?

 

I used a Taper reamer in a friends mill, you could use a drill press if you can clamp the part level and strong enough.